EXHIBIT 99.A Exhibit A --------- Agreement of Joint Filing ------------------------- The undersigned hereby agree that a single Schedule 13G (or any amendment thereto) relating to the Common Stock of Airspan Networks, Inc. shall be filed on behalf of...

                                                                   Page 21 of 24

                                                                    EXHIBIT 99.A
                                   Exhibit A
                                   ---------

                           Agreement of Joint Filing
                           -------------------------

     The undersigned hereby agree that a single Schedule 13G (or any amendment
thereto) relating to the Common Stock of Airspan Networks, Inc. shall be filed
on behalf of each of the undersigned and that this Agreement shall be filed as
an exhibit to such Schedule 13G.

Dated:  February 14, 2001

XXXXX XXXXX FUND V L.P.             /s/ Xxxx X. Xxxxxxx
                                    ------------------------------------------
By SRB ASSOCIATES V L.P.,           Signature
Its General Partner
                                    Xxxx X. Xxxxxxx
                                    General Partner


XXXXX XXXXX V AFFILIATES FUND L.P.  /s/ Xxxx X. Xxxxxxx
                                    -------------------------------------------
By SRB ASSOCIATES V L.P.,           Signature
Its General Partner
                                    Xxxx X. Xxxxxxx
                                    General Partner


SRB ASSOCIATES V L.P.               /s/ Xxxx X. Xxxxxxx
                                    --------------------------------------------
                                    Signature

                                    Xxxx X. Xxxxxxx
                                    General Partner


XXXXX XXXXX FUND VI L.P.            /s/ Xxxx X. Xxxxxxx
                                    --------------------------------------------
By SRB ASSOCIATES VI L.P.,          Signature
Its General Partner

                                    Xxxx X. Xxxxxxx
                                    General Partner


XXXXX XXXXX VI AFFILIATES FUND L.P. /s/ Xxxx X. Xxxxxxx
                                    --------------------------------------------
By SRB ASSOCIATES VI L.P.,          Signature
Its General Partner

                                    Xxxx X. Xxxxxxx
                                    General Partner


                                                                   Page 22 of 24


SRB ASSOCIATES VI L.P.              /s/ Xxxx X. Xxxxxxx
                                    --------------------------------------------
                                    Signature

                                    Xxxx X. Xxxxxxx
                                    General Partner


XXX X. XXXXXXX                      /s/ Xxxx X. Xxxxxxx
                                    --------------------------------------------
                                    Signature

                                    Xxxx X. Xxxxxxx
                                    Attorney-In-Fact


XXXXXXX X. XXX                      /s/ Xxxx X. Xxxxxxx
                                    --------------------------------------------
                                    Signature

                                    Xxxx X. Xxxxxxx
                                    Attorney-In-Fact


XXXXXXX X. DOMENIK                  /s/ Xxxx X. Xxxxxxx
                                    --------------------------------------------
                                    Signature

                                    Xxxx X. Xxxxxxx
                                    Attorney-In-Fact


XXXX X. XXXXXXX                     /s/ Xxxx X. Xxxxxxx
                                    --------------------------------------------
                                    Signature


XXXXXXX X. XXXXXX                  /s/ Xxxx X. Xxxxxxx
                                   ---------------------------------------------
                                   Signature


                                   Xxxx X. Xxxxxxx
                                   Attorney-In-Fact


                                                                   Page 23 of 24

XXXXXXXX XXXX XXXXXXX              /s/ Xxxx X. Xxxxxxx
                                   ---------------------------------------------
                                   Signature

                                   Xxxx X. Xxxxxxx
                                   Attorney-In-Fact