Hi to all,
I have a problem with CME (on 2811 and on UC500) with Quescom gsm gateway, all work fine but when I place a call to a mobile I don't hear ringback tone until mobile phone start to ring (4-6 sec), I mean that I don't hear progress ringback tone.
It seems (but I'm not sure) that QuesCom gateway does not handle 183 Progress messages and support 180 Ringing with SDP.
Can anybody know the problem or have any solutions?
Here the dial-peer for outgoing calls configured.
dial-peer voice 14 voip
description *** Quescom Outgoing to Mobile ***
translation-profile outgoing delzero
session protocol sipv2
session target ipv4:192.168.254.244
Thank you very much