Contract

Exhibit 10.29.1

27 August 2013

VIA EMAIL

Xx. Xxxxx Xxxxxx

Chief Financial Officer

Mavenir Systems, Inc.

0000 X Xxxxxxxxx, Xxxxx 000

Xxxxxxxxxx, XX 00000

Re: Reseller OEM Agreement, dated 28 October 2008 (the “Agreement”)

Dear Xxxxx:

Pursuant to Section 14.1 of the above referenced Agreement, please accept this letter as Cisco Systems, Inc. sixty (60) day written notification to Mavenir Systems, Inc. to extend the term of the Agreement for an additional one year term, through 28 October 2014.

If you should have any questions or concerns regarding this matter, please do not hesitate to contact me.

Very truly yours,

/s/ Xxxxxx Xxxxx

Xxxxxx Xxxxx

Manager, Product Management

MITG

Cisco Systems, Inc.