my uc520 uses a SIP Gsm gateway for incoming and outgoing gsm calls.
We have no problem with outgoing calls, but when we receive the incoming calls it behaves wrong.
The incoming call is correctly forwarded to the interval UC520 IVR and when I choose an internal number the call is correctly forwarded to the right phone. The phone rings and as soon as I answer it the call is dropped within less than 1 second.
the final message i get from debug ccsip message is:
CSeq: 803 BYE
IN attachment all the debug for a full incoming call.
(10 is the number associated with my IVR and 14 is the number associated to the internal phone).
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