ISDA® International Swap Dealers Association, Inc. MASTER AGREEMENT dated as of November 29, 2006

(Multicurrency—Cross Border)

ISDA®

International Swap Dealers Association, Inc.

MASTER AGREEMENT

dated as of November 29, 2006

CREDIT SUISSE INTERNATIONAL

(“Party A”)

And

XXXXX FARGO BANK, N.A.

not in its individual capacity but solely as Securities Administrator under the Pooling and Servicing Agreement (as defined herein), acting as Auction Administrator for the benefit of the Holders of the Auction Certificates

("Party B")

have entered and/or anticipate entering into one or more transactions (each a “Transaction”) that are or will be governed by this Master Agreement, which includes the schedule (the “Schedule”), and the documents and other confirming evidence (each a “Confirmation”) exchanged between the parties confirming those Transactions.

Accordingly, the parties agree as follows:—

1. Interpretation

(a) Definitions. The terms defined in Section 14 and in the Schedule will have the meanings therein specified for the purpose of this Master Agreement.

(b) Inconsistency. In the event of any inconsistency between the provisions of the Schedule and the other provisions of this Master Agreement, the Schedule will prevail. In the event of any inconsistency between the provisions of any Confirmation and this Master Agreement (including the Schedule), such Confirmation will prevail for the purpose of the relevant Transaction.

(c) Single Agreement. All Transactions are entered into in reliance on the fact that this Master Agreement and all Confirmations form a single agreement between the parties (collectively referred to as this “Agreement”), and the parties would not otherwise enter into any Transactions.

2. Obligations

(a) General Conditions.

(i) Each party will make each payment or delivery specified in each Confirmation to be made by it, subject to the other provisions of this Agreement.

(ii) Payments under this Agreement will be made on the due date for value on that date in the place of the account specified in the relevant Confirmation or otherwise pursuant to this Agreement, in freely transferable funds and in the manner customary for payments in the required currency. Where settlement is by delivery (that is, other than by payment), such delivery will be made for receipt on the due date in the manner customary for the relevant obligation unless otherwise specified in the relevant Confirmation or elsewhere in this Agreement.

(iii) Each obligation of each party under Section 2(a)(i) is subject to (1) the condition precedent that no Event of Default or Potential Event of Default with respect to the other party has occurred and is continuing, (2) the condition precedent that no Early Termination Date in respect of the relevant Transaction has occurred or been effectively designated and (3) each other applicable condition precedent specified in this Agreement.

ISDA ® 1992

value of that which was (or would have been) required to be delivered as of the originally scheduled date for delivery, in each case together with (to the extent permitted under applicable law) interest, in the currency, of such amounts, from (and including) the date such amounts or obligations were or would have been required to have been paid or performed to (but excluding) such Early Termination Date, at the Applicable Rate. Such amounts of interest will be calculated on the basis of daily compounding and the actual number of days elapsed. The fair market value of any obligation referred to in clause (b) above shall be reasonably determined by the party obliged to make the determination under Section 6(e) or, if each party is so obliged, it shall be the average of the Termination Currency Equivalents of the fair market values reasonably determined by both parties.

IN WITNESS WHEREOF the parties have executed this document on the respective dates specified below with effect from the date specified on the first page of this document.

CREDIT SUISSE INTERNATIONAL	XXXXX FARGO BANK, N.A. not in its individual capacity but solely as Securities Administrator under the Pooling and Servicing Agreement (as defined herein), acting as Auction Administrator for the benefit of the Holders of the Auction Certificates

("Party A")	("Party B")


By:/s/ Xxxxxx Xxxxxxxxx Name: Xxxxxx Xxxxxxxxx Title: Authorized Signatory
By:/s/ Bik Xxxx Xxxxx Name: Bik Xxxx Xxxxx Title: Authorized Signatory	By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Vice Presideint

ISDA ® 1992

SCHEDULE

TO THE

MASTER AGREEMENT

DATED AS OF NOVEMBER 29, 2006

between

CREDIT SUISSE INTERNATIONAL,

(“Party A”)

and

XXXXX FARGO BANK, N.A.

(“Party B”)

Part 1

TERMINATION PROVISIONS

(a)

“Specified Entity” means

in relation to Party A for the purpose of:

Section 5(a)(v) (Default under Specified Transaction)

Not Applicable

Section 5(a)(vi) (Cross Default)

Not Applicable

Section 5(a)(vii) (Bankruptcy)

Not Applicable

Section 5(b)(iv) (Credit Event Upon Merger)

Not Applicable

and in relation to Party B for the purpose of:

Section 5(a)(v) (Default under Specified Transaction)

Not Applicable

Section 5(a)(vi) (Cross Default)

Not Applicable

Section 5(a)(vii) (Bankruptcy)

Not Applicable

Section 5(b)(iv) (Credit Event Upon Merger)

Not Applicable

(b)

“Specified Transaction” will have the meaning assigned in Section 14 of this Agreement.

(c)

The “Cross-Default” provisions of Section 5(a)(vi)

will not apply to Party A.

will not apply to Party B.

(d)

The “Credit Event Upon Merger” provisions of Section 5(b)(iv)

will not apply to Party A.

will not apply to Party B.

(e)

The “Automatic Early Termination” provision of Section 6(a)

will not apply to Party A.

will not apply to Party B.

(f)

Payments on Early Termination. For the purpose of Section 6(e) of this Agreement but subject to Part 5 of this Schedule:

(i)

Loss will apply.

(ii)

The Second Method will apply.

(g)

“Termination Currency” means United States Dollars.

(h)

Additional Termination Events. The following Additional Termination Events will apply

(i) If, upon the occurrence of a Swap Disclosure Event (as defined in Part 5(r) below) Party A has not within five (5) Business Days after such Swap Disclosure Event (without giving effect to any grace period otherwise provided herein or otherwise) complied with any of the provisions set forth in Part 5(r) below, then an Additional Termination Event shall have occurred with respect to Party A, and Party A shall be the sole Affected Party with respect to such Additional Termination Event.

(ii) If, Party A fails to comply with any of the provisions set forth in Part 5(n), then an Additional Termination Event shall have occurred with respect to Party A, and Party A shall be the sole Affected Party with respect to such Additional Termination Event.

(i)

The “Breach of Agreement” provisions of Section 5(a)(ii), the “Misrepresentation” provisions of Section 5(a)(iv) and the “Default Under Specified Transaction” provisions of Section 5(a)(v)

will not apply to Party A.

will not apply to Party B.

(j) (i) The “Bankruptcy” provisions of Section 5(a)(vii) will not apply to Party B;

(ii) The “Merger Without Assumption” provisions of Section 5(a)(viii) will not apply to Party B;

(iii) The “Credit Support Default” provisions of Section 5(a)(iii) will not apply to Party B; and

(iv) The “Illegality” provisions of Section 5(b)(i), the “Tax Event” provisions of Section 5(b)(ii) and the “Tax Event Upon Merger” provisions of Section 5(b)(iii) will not apply to Party B.

Part 2 TAX REPRESENTATIONS

(a)

Payer Tax Representation For the purpose of Section 3(e) of this Agreement, each party will make with respect to itself the following representation:

It is not required by any applicable law, as modified by the practice of any relevant governmental revenue authority, of any Relevant Jurisdiction to make any deduction or withholding for or on account of any Tax from any payment (other than interest under Section 2(e), 6(d)(ii) or 6(e) of this Agreement) to be made by it to the other party under this Agreement. In making this representation, it may rely on (i) the accuracy of any representation made by the other party pursuant to Section 3(f) of this Agreement; (ii) the satisfaction of the agreement of the other party contained in Section 4(a)(i) or 4(a)(iii) of this Agreement and the accuracy and effectiveness of any document provided by the other party pursuant to Section 4(a)(i) or 4(a)(iii) of this Agreement; and (iii) the satisfaction of the agreement of the other party contained in Section 4(d) of this Agreement,

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provided that it shall not be a breach of this representation where reliance is placed on sub-clause (ii) above and the other party does not deliver a form or document under Section 4(a)(iii) by reason of material prejudice to its legal or commercial position.

(b)

Payee Tax Representations For the purposes of Section 3(f), each party makes the following representations:

(i)

The following representation will apply to Party A:

(A) Party A is entering into each Transaction in the ordinary course of its trade as, and is, a recognized UK bank as defined in Section 840A of the UK Income and Corporation Taxes Act of 1988.

(B) Party A has been approved as a Withholding Foreign Partnership by the US Internal Revenue Service.

(D) Party A is a partnership that agrees to comply with any withholding obligation under Section 1446 of the Internal Revenue Code.

(ii)

The following representation will apply to Party B:

It is a statutory trust established under the laws of Delaware.

Part 3

AGREEMENT TO DELIVER DOCUMENTS

For the purpose of Section 4(a)(i) and (ii) of this Agreement, each party agrees to deliver the following documents, as applicable:

(a)

Tax forms, documents or certificates to be delivered are:

Party Required To Deliver Document	Form / Document/ Certificate	Date By Which To Be Delivered
Party A and Party B	Tax forms that may reasonably be required by Party A or Party B, as applicable	(i) Upon execution and delivery of this Agreement; (ii) promptly upon reasonable demand by Party A or Party B, as applicable; and (iii) promptly upon learning that any Form W-8 or Form W-9, as applicable, (or any successor thereto) has become obsolete or incorrect

Schedule

Party Required To Deliver Document	Form / Document/ Certificate	Date By Which To Be Delivered
Party A	Form W8-IMY	(i) Upon execution and delivery of the Form Master Agreement; (ii) promptly upon reasonable demand by Party B; and (iii) promptly upon learning that any Form W-8 or Form W-9, as applicable, (or any successor thereto) has become obsolete or incorrect

(b)

Other documents to be delivered are:

Party Required To Deliver Document	Form / Document/ Certificate	Date By Which To Be Delivered	Covered By Section 3(d) Representation
Party A & B	Incumbency Certificate or other evidence of signing authority.	Upon execution of this Agreement and, if requested, any Confirmation.	Yes
Party A	its audited annual report	As soon as possible after request.	Yes
Party A	Authorizing resolution of managing board (e.g., Certified Board of Directors Resolution) approving each type of Transaction contemplated hereunder and the arrangements contemplated herein.	Upon execution of this Agreement and, if requested, any Confirmation.	Yes
Party B	Copies of all statements delivered to the Holders of the Auction Certificates under the Pooling and Servicing Agreement.	On each Distribution Date (as such term is defined in the Pooling and Servicing Agreement).	Yes
Party B	Executed copy of the Pooling and Servicing Agreement.	Upon execution thereof.	Yes

Schedule

Party Required To Deliver Document	Form / Document/ Certificate	Date By Which To Be Delivered	Covered By Section 3(d) Representation
Party A	A written opinion of counsel to Party A as to the enforceability of this Agreement that is reasonably satisfactory in form and substance to Party B.	Upon execution of this Agreement.	No
Party A & B	Such party’s Credit Support Documents, if any.	Upon execution of this Agreement.	Yes

Part 4

MISCELLANEOUS

(a)

Addresses For Notices For the purpose of Section 12(a) of this Agreement:-

(i)

Notices or communications shall, with respect to a particular Transaction, be sent to the address, telex number or facsimile number reflected in the Confirmation of that Transaction. In addition (or in the event the Confirmation for a Transaction does not provide relevant Addresses/information for notice), with respect to notices provided pursuant to Section 5 and 6 of this Agreement, notice shall be provided to:

Address for notices or communications to Party A (other than by facsimile):

Address:

One Xxxxx Xxxxxx

Xxxxxx X00 0XX

Xxxxxxx

Attention:

Head of Credit Risk Management;

Managing Director - Operations Department; and

Managing Director - Legal Department

Telex No,:

264521 Answerback: CSI G

For the purpose of facsimile notices or communications under this Agreement (other than a notice or communication under Sections 5 or 6):

Facsimile No.:

44 20 7888 2686

Attention:

Managing Director - Legal Department

Telephone number for oral confirmation of receipt of facsimile in legible form: 44 20 7888 2028 Designated responsible employee for the purposes of Section 12(a)(iii): Senior Legal Secretary.

Address for notices or communications to Party B:

Address:

Xxxxx Fargo Bank, N.A.

0000 Xxx Xxxxxxxxx Xxxx

Xxxxxxxx, XX 00000 - 1951

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Attention:

Client Manager - Xxxxxxxxx 0000-0

Phone No.:

(000) 000 0000

Facsimile No.:

(000) 000 0000

(ii)

Notices Section 12(a) is amended by adding in the third line thereof after the phrase “messaging system” and before the “)” the words “; provided, however, any such notice or other communication may be given by facsimile transmission (it being agreed that the sender shall verbally confirm receipt with an officer of the receiving party )”.

(b)

Process Agent For purposes of Section 13(c) of this Agreement:

Party A appoints as its Process Agent: Credit Suisse Securities (USA) LLC, 00 Xxxxxxx Xxxxxx, Xxx Xxxx, Xxx Xxxx 00000, Attention: General Counsel, Legal and Compliance Department.

Party B appoints as its Process Agent: Not applicable

(c)

Offices The provisions of Section 10(a) will apply to this Agreement.

(d)

Multibranch Party For purpose of Section 10(c) of this Agreement:

Party A is not a Multibranch Party.

Party B is not a Multibranch Party.

(e)

Calculation Agent Party A; it being understood that, notwithstanding anything to the contrary in this Agreement, Party A shall be the Calculation Agent irrespective of whether Party A is a Defaulting Party or Affected Party. Notwithstanding Section 6(e) of the Agreement, Party A will be the party entitled to determine Loss.

(f)

Credit Support Documents Details of any Credit Support Documents:

In the case of Party A: Not Applicable.

In the case of Party B: Not Applicable.

(g)

Credit Support Provider means

in relation to Party A: Not Applicable; and

in relation to Party B: Not Applicable

(h)

Governing Law THIS AGREEMENT, AND TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ALL MATTERS ARISING OUT OF OR REGARDING IN ANY WAY THIS AGREEMENT, WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS WHOLLY PERFORMED WITHIN NEW YORK, WITHOUT REFERENCE TO CHOICE OF LAW DOCTRINE.

(i)

Netting of Payments Sub-paragraph (ii) of Section 2(c) of this Agreement will apply to all Transactions hereunder, unless otherwise provided in the relevant Confirmation(s).

(j)

“Affiliate” will have the meaning specified in Section 14, provided that Party A shall be deemed to have no Affiliates.

Schedule

Part 5 OTHER PROVISIONS

(a)

ISDA Definitions Incorporated by Reference The definitions and provisions contained in the 2000 ISDA Definitions, as published by the International Swaps and Derivatives Association, Inc., are incorporated herein, and the version of the Annex to the 2000 ISDA Definitions that is incorporated herein is the June 2000 version (collectively, the “Definitions”). Any terms used and not otherwise defined herein which are contained in the Definitions shall have the meaning set forth therein. In the event of any conflict between the Definitions and any other ISDA-published definitions referenced in a Confirmation, such Confirmation and the ISDA-published definitions referred to therein shall control for purposes of the particular Transaction. For the avoidance of doubt, any reference to a “Swap Transaction”, if any, in the Definitions is deemed to be a reference to a “Transaction” for the purpose of interpreting this Agreement or any Confirmation, and any reference to a “Transaction” in this Agreement or any Confirmation is deemed to be a reference to a “Swap Transaction” for the purpose of interpreting the Definitions.

(b)

Other Defined Terms Terms used and not defined in this Agreement or in the Definitions, shall have the respective meanings ascribed to such terms in the Auction Administration Agreement, and if not defined therein, in the Pooling and Servicing Agreement dated as of November 1, 2006, for TMST 2006-6 among Credit Suisse First Boston Mortgage Securities Corp., as Depositor, Xxxxxxxxx Mortgage Home Loans, Inc., as Seller, Wilmington Trust Company, as Delaware Trustee, Xxxxx Fargo Bank, N.A., as Master Servicer and Securities Administrator, and LaSalle Bank National Association, as Trustee and Custodian, as amended and supplemented from time to time (the "Pooling and Servicing Agreement").

(c)

No Set-Off Notwithstanding anything to the contrary in this Agreement, all payments shall be made without any Set-Off.

(d)

Condition Precedent The condition precedent specified in Section 2(a)(iii)(1) of this Agreement does not apply to a payment or delivery owing by a party if the other party shall have satisfied in full all its payment and delivery obligations under Section 2(a)(i) of this Agreement and shall at the relevant time have no future payment or delivery obligations, whether absolute or contingent, under Section 2(a)(i).

(e)

Additional Representations Section 3 is hereby amended by adding at the end thereof the following subparagraphs:

(g)

“No Agency In case of Party A, it is entering into this Agreement, any Credit Support Document and any other document relating to this Agreement and each Transaction hereunder as principal and not as agent or in any capacity, fiduciary or otherwise, and no other person has an interest herein, and in case of Party B, it is entering into this Agreement, any Credit Support Document and any other document relating to this Agreement and each Transaction hereunder solely as agent for the Holders of the Auction Certificates (as such term is defined in the Pooling and Servicing Agreement and as authorized therein), and no other person, other than the Holders of the Auction Certificates, has an interest herein.

Schedule

(h)

Legal and Beneficial Owner It will be the legal and beneficial owner of any securities it is required to deliver under this Agreement and any Transaction at the time of each delivery, free from all liens, charges, equities, rights of pre-emption or other security interests or encumbrances whatsoever, unless otherwise expressly provided in a Confirmation for a Transaction, and such securities will not constitute “restricted securities” or “control stock” under the Securities Act (as defined below).

(i)

US Federal Securities Laws Each party represents to the other party that:

(i)

It is a “qualified institutional buyer” as defined in Rule 144A under the United States Securities Act of 1933, as amended (the “Securities Act”); and

(ii)

It understands that certain Transactions under the Agreement may constitute the purchase or sale of “securities” as defined in the Securities Act and understands that any such purchase or sale of securities will not be registered under the Securities Act and that any such Securities Transactions may not be reoffered, resold, pledged, sub-participated or otherwise transferred except (x) in accordance with the Agreement, (y) pursuant to an effective registration statement under the Securities Act or pursuant to an exemption from the registration requirements of the Securities Act and (z) in accordance with any applicable securities laws of any state of the United States.

(j)

Financial Institution Status In the case of Party A, it is a “financial institution”, in that it engages, will engage and holds itself out as engaging in “financial contracts,” as a counterparty on both sides of one or more “financial markets” (as such quoted terms are defined in Regulation EE of the US Federal Reserve Board, 12 C.F.R. Part 231) and it fulfills at least one of the quantitative tests contained in such Regulation EE (12 C.F.R. §231(a)(1) or (a)(2)).”

(f)

Swap Exemption Each party hereto represents to the other party on and as of the date hereof and on each date on which a Transaction is entered into between them hereunder, that it is an “eligible contract participant” as defined in Section 1a(12) of the Commodity Exchange Act, as amended.

(g)

Relationship between Parties In connection with the negotiation of, the entering into, of this Agreement, and any other documentation relating to this Agreement to which it is a party or that it is required by this Agreement to deliver, each party hereby represents and warrants, and, in connection with the negotiation of, the entering into, and the confirming of the execution of each Transaction, each party will be deemed to represent, to the other party as of the date hereof (or, in connection with any Transaction, as of the date which it enters into such Transaction) that (absent a written agreement between the parties that expressly imposes affirmative obligations to the contrary for that Transaction and in accordance with Section 3(g)):

(i)

Non-Reliance It is acting for its own account, and it has made its own independent decisions to enter into that Transaction and as to whether that Transaction is appropriate or proper for it based upon its own judgment and upon advice from such advisers as it has deemed necessary. It is not relying on any communication (written or oral) of the other party as investment advice or as a recommendation to enter into that Transaction; it being understood that information and explanations related to the terms and conditions of a Transaction shall not be considered investment advice or a recommendation to enter into that Transaction. No communication (written or oral) received from the other party shall be deemed to be an assurance or guarantee as to the expected results of that Transaction.

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(ii)

Assessment and Understanding It is capable of assessing the merits of and understanding (on its own behalf or through independent professional advice), and understands and accepts, the terms, conditions and risks of that Transaction. It is also capable of assuming, and assumes, the risks of that Transaction. It has determined to its satisfaction whether or not the rates, prices or amounts and other economic terms of each Transaction and the indicative quotations (if any) provided by the other party reflect those in the relevant market for similar transactions, and all trading decisions have been the result of arm’s length negotiations between the parties.

(iii)

Status of Parties The other party is not acting as a fiduciary for or an adviser to it in respect of that Transaction.

(iv)

Related Transactions It is aware that each other party to this Agreement and its Affiliates may from time to time (A) take positions in instruments that are identical or economically related to a Transaction or (B) have an investment banking or other commercial relationship with the issuer of an instrument underlying a Transaction.

(h)

Additional Representations of Party B Party B hereby acknowledges and agrees that (i) with respect to this Agreement and each Transaction, Party B will maintain, and be in full compliance with, all operative and constituent documents of Party B, and (ii) each Transaction will also comply in all respects with all applicable laws, rules, regulations, interpretations, guidelines, procedures, and policies of applicable governmental and regulatory authorities affecting Party B or the performance of its obligations hereunder.

(i)

Confidential Information Each party may share any information concerning the other party with any of its Affiliates.

(j)

Waiver of Jury Trial EACH PARTY HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY PROCEEDINGS ARISING OUT OF OR RELATING TO THIS AGREEMENT OR ANY TRANSACTION.

(k)

Consent to Telephonic Recording Each party hereto consents to the monitoring or recording, at any time and from time to time, by the other party of the telephone conversations of trading and marketing personnel of the parties and their authorized representatives in connection with this Agreement or any Transaction or potential Transaction; and the parties, waive any further notice of such monitoring or recording and agree to give proper notice and obtain any necessary consent of such personnel or any such monitoring or recording.

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(l)

No Bankruptcy Petition Party A agrees that it will not, prior to the date that is one year and one day following the termination of the Pooling and Servicing Agreement, acquiesce, petition or otherwise invoke or cause Party B to invoke the process of any governmental authority for the purpose of commencing or sustaining a case (whether voluntary or involuntary) against Party B under any bankruptcy, reorganization, arrangement, insolvency, moratorium, liquidation or similar law or proceeding or appointing a receiver, liquidator, assignee, trustee, custodian, sequestrator or other similar official of Party B or any substantial part of its property or ordering the winding-up or liquidation of the affairs of Party B; provided, that this provision shall not restrict or prohibit Party A from joining any other person in any bankruptcy, reorganization, arrangement, insolvency, moratorium or liquidation proceedings already commenced or other analogous proceedings already commenced under applicable law; and provided, further, that this provision shall not constitute a waiver by Party A of its right to the proceeds of any bankruptcy, reorganization, arrangement, insolvency, moratorium or liquidation proceedings instituted by third parties against Party B under applicable law.

(m)

Notice of Transfer or Amendment Party A and Party B acknowledge and agree to provide prior written notice to the Rating Agencies (as such term is defined in the Pooling and Servicing Agreement) of any transfer or amendment of this Agreement or any Confirmation.

(n)

Ratings Event

(i)

If (1) the short-term unsecured debt rating of Party A is at any time not at least “P-1” (without regard to whether such rating may be on negative watch) by Xxxxx’x Investors Service, Inc. (“Moody’s”), (2) the long-term unsecured debt rating of Party A is at any time not at least "A2" (without regard to whether such rating may be on negative watch) by Moody's, (3) if Party A has a short-term unsecured debt rating from Standard and Poor's Ratings Service, a division of The XxXxxx-Xxxx Companies, Inc. ("S&P"), such rating is at any time not at least "A-1" or (4) if Party A does not have a short-term unsecured debt rating from S&P, the long-term unsecured debt rating of Party A from S&P is at any time not at least "A+" (such occurrence, a “Ratings Event” and such ratings the “Approved Ratings Threshold”), Party A shall within 30 days of such Ratings Event, at its own cost and subject to the Rating Agency Condition, either (A) assign all its rights and obligations under this Agreement to a substitute party selected by Party A who meets or exceeds (or whose Credit Support Provider meets or exceeds) the Approved Ratings Threshold, (B) obtain a guaranty of another person selected by Party A who meets or exceeds the Approved Ratings Threshold or (C) deliver collateral, in an amount sufficient to maintain the then-current ratings of the Auction Certificates pursuant to a Credit Support Annex.

(ii)

Notwithstanding anything to the contrary in this Part 5(n), if (1) the short-term unsecured debt rating of Party A is at any time not at least “P-2” (without regard to whether such rating may be on negative watch) by Moody’s, (2) the long-term unsecured debt rating of Party A is at any time not at least "A3" (without regard to whether such rating may be on negative watch) by Moody's, or (3) the long-term unsecured debt rating of Party A is at any time not at least "BBB-" by S&P (or is withdrawn), Party A shall at its own expenses and subject to the Rating Agency Condition, with respect to S&P only, comply with clause (A) or (B) above of Part 5(n)(i) within ten (10) days.

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(iii)

For purposes of this Agreement, “Rating Agency Condition” means, with respect to any particular proposed act or omission to act hereunder that the party acting or failing to act must consult with Moody’s and S&P and receive from Moody’s and S&P a prior written confirmation that the proposed action or inaction would not cause a downgrade or withdrawal of the then-current rating of the Auction Certificates.

(o)

Transfer Notwithstanding Section 7 of this Agreement and subject to the Rating Agency Condition, Party A and any applicable Credit Support Provider shall have the right to transfer their respective rights and obligations hereunder to a substitute counterparty provided that such substitute counterparty (or such substitute counterparty’s Credit Support Provider) shall have a credit rating of its long-term debt obligations no lower than the current rating of the long-term debt obligations of Party A.

(p) Additional Information. Party A hereby agrees to cooperate in a commercially reasonable manner with any requests from Party B to provide any information required pursuant to Item 1119 of Regulation AB under the Securities Act of 1933. The parties hereby agree, that if Party A, acting in a commercially reasonable manner, cannot comply with a request by Party B for such additional information, Party A shall transfer its rights and obligations hereunder to a transferee pursuant to Part 5(o) above.

(q)

Rating Agency Condition for Amendment. In addition to the requirements of Section 9, this Agreement will not be amended unless the Rating Agency Condition has first been met.

(r)

Compliance with Regulation AB

(i)

It shall be a swap disclosure event ("Swap Disclosure Event") if, at any time after the date hereof, until such date that the Auction Certificates are no longer required to make public reports under the Securities Exchange Act of 1934, as amended, the Depositor or the Sponsor notifies Party A that the aggregate "significance percentage" (calculated in accordance with the provisions of Item 1115 of Regulation AB) of all derivative instruments provided by Party A and any of its affiliates to Party B (collectively, the "Aggregate Significance Percentage") is 10% or more.

(ii)

Upon the occurrence of a Swap Disclosure Event, Party A, at its own cost and expense (and without any cost or expense to, or liability of, Party B, the Depositor, the Sponsor, the Underwriters, the Trustee, or the Issuing Entity), shall take one of the following actions:

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(a)

provide to the Sponsor and the Depositor: (i) if the Aggregate Significance Percentage is 10% or more, but less than 20%, the information required under Item 1115(b)(1) of Regulation AB or (ii) if the Aggregate Significance Percentage is 20% or more, within five (5) Business Days, the financial information required under Item 1115(b)(2) of Regulation AB, (each, "Swap Financial Disclosure"); or

(b)

not withstanding anything to the contrary in Part 5(o) of this Agreement, assign its rights and delegate its obligations under the Transaction to a counterparty with the Approved Ratings Thresholds (or which satisfies the Rating Agency Condition), that (x) provides the information specified in clause (a) above to the Depositor and Sponsor and (y) enters into an ISDA Master Agreement and related documentation substantially similar to the documentation then in place between Party A and Party B and subject to prior notification to the Rating Agencies, provided, that satisfaction of the Rating Agency Condition shall be required in regards to S&P only for any transfer of any Transactions under this clause (b) unless such transfer is in connection with the assignment and assumption of this Agreement by such substitute counterparty without modification of its terms other than the following terms: party name, dates relevant to the effective date of such transfer, tax representations (provided that the representations in Part 2(a) are not modified) and any other representations regarding the status of the substitute counterparty of the type included in Section (g) of this Part 5 and notice information (in which case, Party A shall provide written notice to S&P with respect thereto); or

(c)

subject to the Rating Agency Condition and subject to any interpretative guidance issued by the Securities and Exchange Commission that determines that such Swap Financial Disclosure provided by an affiliate of Party A satisfies the requirement of Item 1115 of Regulation AB, obtain a guaranty of Party A’s obligations under this Agreement from an affiliate of Party A that is able to provide the applicable Swap Financial Disclosure satisfactory in form and substance to the Sponsor and the Depositor, and cause such affiliate to provide to the Sponsor and the Depositor such Swap Financial Disclosure within five (5) Business Days

The Securities Administrator shall be under no obligation to monitor the responsibilities of Party A under clause 5(r)(ii).

(iii)

For so long as the Aggregate Significance Percentage is 10% or more and a Swap Disclosure Event is continuing, Party A shall provide any updates to the information provided pursuant to clause (ii) above to the Sponsor and the Depositor within five (5) Business Days following availability thereof (but in no event more than 45 days after the end of each of Party A's fiscal quarter for any quarterly update, and in no even more than 90 days after the end of each of Party A's fiscal year for any annual update).

(iv)

All information provided pursuant to clauses (ii) and (iii) above shall be in a form suitable for conversion to the format required for filing by the Depositor with the Commission via the Electronic Data Gathering and Retrieval System (XXXXX). In addition, any such information, if audited, shall be accompanied by any necessary auditor's consents to the extent required by Regulation AB or, if such information is unaudited and if required by the provisions of Regulation AB, shall be accompanied by an appropriate agreed-upon procedures or comparable letter from Party A's accountants. If permitted by Regulation AB, any such information may be provided by reference to or incorporation by reference from reports filed pursuant to the Exchange Act.

Schedule

In Witness Whereof, Party A and Party B have caused this Schedule to be duly executed as its act and deed as of the date first written above.

CREDIT SUISSE INTERNATIONAL

By /s/ Xxxxxx Xxxxxxxxx
Name: Xxxxxx Xxxxxxxxx
Title: Authorized Signatory

By /s/ Bik Xxxx Xxxxx
Name: Bik Xxxx Xxxxx
Title: Authorized Signatory

XXXXX FARGO BANK, N.A.,

not in its individual capacity but solely as Securities

Administrator under the Pooling and Servicing

Agreement, acting as Auction Administrator and

intermediary agent for the Holders of the Auction

Certificates

By /s/ Xxxxx X. Xxxxxx
Name: Xxxxx X. Xxxxxx
Title: Vice President

Schedule

	CREDIT SUISSE INTERNATIONAL
	Xxx Xxxxx Xxxxxx, Xxxxxx X00 0XX	Telephone 000 0000 0000 xxx.xxxxxx-xxxxxx.xxx

November 29, 2006

XXXXX FARGO BANK, N.A., not in its individual capacity but solely as Securities Administrator under the Pooling and Servicing Agreement (referred to below), acting as Auction Administrator for the benefit of the Holders of the Auction Certificates

External ID: 9358017

Dear Sir/Madam

The purpose of this letter agreement (this "Confirmation") is to confirm the terms and conditions of the Transaction entered into between us on the Trade Date specified below (the "Transaction"). This Confirmation constitutes a "Confirmation" as referred to in the Agreement specified below.

In this Confirmation "CSIN" means Credit Suisse International and "Counterparty" means the Auction Administrator.

The definitions and provisions contained in the 2000 ISDA Definitions (as published by the International Swaps and Derivatives Association, Inc.) are incorporated into this Confirmation. In the event of any inconsistency between those definitions and provisions and this Confirmation, this Confirmation will govern.

This Confirmation supplements, forms part of, and is subject to, the 1992 ISDA Master Agreement dated as of November 29, 2006 as amended and supplemented from time to time (the "Agreement"), between CSIN and the Counterparty. All provisions contained in the Agreement govern this Confirmation except as expressly modified below.

All terms used herein and not otherwise defined are given their meaning in the Pooling and Servicing Agreement dated as of November 1, 2006, for TMST 2006-6 among Credit Suisse First Boston Mortgage Securities Corp., as Depositor, Xxxxxxxxx Mortgage Home Loans, Inc., as Seller, Wilmington Trust Company, as Delaware Trustee, Xxxxx Fargo Bank, N.A., as Master Servicer and Securities Administrator, and LaSalle Bank National Association, as Trustee and Custodian, as amended and supplemented from time to time (the "Pooling and Servicing Agreement") or, if not defined in the Pooling and Servicing Agreement, in the Auction Administration Agreement, dated as of November 29, 2006 between Xxxxx Fargo Bank, N.A., as auction administrator, and CSIN (the "Auction Administration Agreement"). In the event of an inconsistency between the terms defined in the Pooling and Servicing Agreement or the Auction Administration Agreement and this Confirmation, this Confirmation will govern.

CSIN and Counterparty each represents to the other that it has entered into this Swap Transaction in reliance upon such tax, accounting, regulatory, legal, and financial advice as it deems necessary and not upon any view expressed by the other.

External ID: 9358017 / Risk ID: 563210138

Registered Office as above

Registered with unlimited liability in England under No. 2500199

Authorised and Regulated by the Financial Services Authority

VAT No: GB 447 0737 41

2.	The terms of the particular Transaction to which this Confirmation relates are as follows:

Trade Date:

November 17, 2006.

Effective Date:

November 29, 2006.

Auction Distribution Date:

The Distribution Date in November 2011.

Termination Date:

The earlier to occur of (i) the Auction Distribution Date and (ii) the date on which the Class Certificate Principal Balance of each of the Reference Obligations has been reduced to zero.

Reference Obligations:

The Class A-1 and Class A-2 Certificates issued on November 29, 2006 pursuant to the Pooling and Servicing Agreement.

CSIN Floating Amount:

The sum of the Auction Deficiency Amounts, defined below for each Reference Obligation.

CSIN Payment Date:

The Auction Distribution Date.

Counterparty Floating Amount:

The sum of the Auction Excess Amounts for each Reference Obligation.

Counterparty Payment Date:

The Auction Distribution Date.

Auction Deficiency Amount:

With respect to each Reference Obligation, an amount in USD equal to the excess, if any, of (a) the aggregate Par Price of the Auction Certificates constituting such Reference Obligation over (b) the aggregate Auction Proceeds of the Auction Certificates constituting such Reference Obligation.

Auction Excess Amount:

With respect to each Reference Obligation, the amount equal to the excess, if any, of (a) the aggregate Auction Proceeds of the Auction Certificates constituting such Reference Obligation over (b) the aggregate Par Price of the Auction Certificates constituting such Reference Obligation.

Business Day:

New York and any other city in which the corporate Trust Office of the Securities Administrator is located.

Calculation Agent:

CSIN.

3.	Other Provisions:

Upfront Payment:

Upfront Payer:

CSIN

Upfront Payment Amount:

USD 0

4.	Account Details:

Payments to CSIN:

As advised separately in writing.

Payments to Counterparty:

Xxxxx Fargo Bank, NA

ABA 121 000 248

Account Number: 0000000000

Account Name: Corporate Trust Clearing

FFC: Xxxxxxxxx 06 6 Swap Proceeds Account

Number: 00000000

For the purpose of facilitating this Transaction, an Affiliate of CSIN, which is organized in the United States of America (the “Agent”), has acted as agent for CSIN. The Agent is not a principal with respect to this Transaction and shall have no responsibility or liability to the parties as a principal with respect to this Transaction.

Credit Suisse International is authorized and regulated by the Financial Services Authority and has entered into this transaction as principal. The time at which the above transaction was executed will be notified to Counterparty on request.

Please confirm that the foregoing correctly sets forth the terms of our agreement by executing the copy of this Confirmation enclosed for that purpose and returning it to us.

Yours faithfully,

Credit Suisse International

By: /s/ Xxxxxx Xxxxxxxxx
Name: Xxxxxx Xxxxxxxxx
Title: Authorized Signatory

Confirmed as of the date first written above:

XXXXX FARGO BANK, N.A., not in its individual capacity but solely as Securities Administrator under the Pooling and Servicing Agreement, acting as Auction Administrator for the benefit of the Holders of the Auction Certificates

By: /s/ Xxxxx X. Xxxxxx
Name: Xxxxx X. Xxxxxx
Title: Vice President

External ID: 9358017/ Risk ID: 563210138

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Table of Contents

ISDA® International Swap Dealers Association, Inc. MASTER AGREEMENT dated as of November 29, 2006

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