We've had some problems with the Polycom phones use of SIP REFER messages with Cisco and Adtran voice gateways. Call transfers and holds fail due to incompatibilities in the way the Cisco and Adtran routers handle these events. My understanding is the routers use a mid-call INVITE rather than SIP REFER messages. This forces us to send calls through the sipXbridge, like Asterisk, and that limits scalability.
We've noticed other phones in the list like Grandstream , Aastra, Snom, etc. Do you guys know which phones in the sipX list work well with Cisco and Adtran voice gateways? Thanks, Ken
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