Whilst I've been messing about with registering a Grandstream GXP2000 to our CME 4.1 server's SIP service, I've found quite an annoying problem.
The phone registers fine and can make external calls via the SIP trunk absolutely fine. The phone will also accept transfers of internal calls (ephones), <strong>but</strong> if I attempt to transfer an external call form an ephone, to the Granstream - the external call is cut-off. I've isolated the 'debug ccsip messages' output which describes what is happening, but I'm by no means an expert in debugging SIP output.
Aug 14 09:16:49.807: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Where 'cme-router' is the router on which CME 4.1 is installed and running, and 'asterisk-sip-gateway' is our SIP gateway (which the CME 4.1 SIP-UA connects to) that handles more advanced call routing features.
If anyone has any ideas - I'd appreciate the help! It's not a massive problem, but I'm keen to see this one through. I should be able to upgrade to CME 4.2 at some point this week, so we'll have to see if that helps matters.
Hi, can someone help on this. I am having the same issue. A SIP phone can transfer to a skinny phone, but a skinny phone cannot transfer a call to a sip phone. however skinny phone can call directly no problem.
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