Avaya Inc. (USA)

Cisco Systems, Inc. (USA)

Broadsoft, Inc. (USA)

Damaka Inc., (USA)

Digium, Inc. (USA)

Ericsson (Sweden)

Huawei Technologies (China)

IBM Corporation (USA)

Microsoft Corporation (USA)

Mitel (Canada)

Mobisma AB (Sweden)

NEC Corporation of America (USA)

Nokia Networks (Finland)

Ribbon Communications, Inc. (USA)

Unify, Inc. (USA)

Verizon Enterprise Solutions (USA)

XO Communications (USA)