Exhibit A --------- Each of the undersigned hereby agrees that Amendment No. 1 the Schedule 13G filed on the date hereof with respect to the shares of Common Stock of Polycom, Inc. has been filed on behalf of the undersigned. Signature: ---------...

                                      Exhibit A
                                      ---------


     Each of the undersigned hereby agrees that Amendment No. 1 the Schedule 
13G filed on the date hereof with respect to the shares of Common Stock of 
Polycom, Inc. has been filed on behalf of the undersigned.

Signature:
---------


     Dated February 12, 1998


                              Oak Investment Partners IV,
                              Limited Partnership

                              By:  Oak Associates IV, LLC,
                                   As General Partner


                              By:  /s/ Xxxxxx X. Xxxxxxxxxx
                                   ------------------------
                                  Managing Member

                              Oak Associates IV, LLC


                              By:  /s/ Xxxxxx X. Xxxxxxxxxx
                                   ------------------------
                                   Managing Member


                              Oak IV Affiliates Fund, Limited
                              Partnership

                              By:  Oak IV Affiliates, As General
                                   Partner


                              By:  /s/ Xxxxxx X. Xxxxxxxxxx       
                                   ------------------------
                                   General Partner


                              Oak IV Affiliates


                              By:  /s/ Xxxxxx X. Xxxxxxxxxx       
                                   ------------------------
                                   General Partner







                              OAK MANAGEMENT CORPORATION


                              By:  /s/ Xxxxxx X. Xxxxxxxxxx
                                   ------------------------
                                   Name:  Xxxxxx X. Xxxxxxxxxx
                                   Title: President



                                   /s/ Xxxxxx X. Xxxxxx
                                   ------------------------
                                   Xxxxxx X. Xxxxxx



                                   /s/ Xxxxxx X. Xxxxxxxxx
                                   ------------------------
                                   Xxxxxx X. Xxxxxxxxx



                                   /s/ Xxxxxx X. Xxxxxxxxxx
                                   ------------------------
                                   Xxxxxx X. Xxxxxxxxxx


                              
                                   /s/ Xxx X. Xxxxxx
                                   ------------------------
                                   Xxx X. Xxxxxx



                                   /s/ Xxxxxx X. More  
                                   ------------------------
                                   Xxxxxx X. Xxxx