I have some problem, I use CUCM7.01 create a sip trunk to my GW2811. GW2811 connection PSTN use ISDN PRI. When I make a call to my cellphone, after finish dial the number, I hear the ringback immediately. but my cellphone not ringing, because connection don't establish. I think the ringback is GW2811 provide. For testing, I change GW mode to H.323, and make call, that call will normal, I can hear ringback until my cellphone ringing, that ringback is music provide form ISP, SIP trunk did not hear that. The real problem is use sip trunk call cellphone, cellphone ringing but hang up the call, This time IPphone still listen normal ringback! not busy or disconnect.
My English is bed, hope everyone can understanding and help me to resolve that problem. THX
12.4(20)T Control Media Cut-Through on SIP 18x Response
Provides the ability to send media backward before a call is established, allowing the remote side to send personalized ringback tones (usually music) as a response before a call is established. This is default behavior but, in some scenarios, causes clipping and may need to be disabled (CLI for disabling this behavior was added for this release).
The command is rtp send-recv and it was added under voice service voip/ sip configuration as on by default.
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