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synologic's Achievements


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  1. Hi, we recently encountered a problem with IVM Answering Attendant after our upstream sip provider disabled audio transcoding on the calls (probably due to performance problems). The setup we are running is as follows: SIP Provider -> Draytek 2810 IP PBX -> IVM Attendant A normal call from a terminal connected to either the IPPBX or directly to the sip provider, and uses g711U works fine, however, an external call (eg mobile, land line) is initiated like this: PBX -> IVM: v=0 o=Sippy 183797232 0 IN IP4 xxx.xxx.xxx.xxx s=VoipCall t=0 0 m=audio 10126 RTP/AVP 8 0 18 8 18 101 c=IN IP4 a=rtpmap:8 PCMA/8000/1 a=ptime:20 a=rtpmap:0 PCMU/8000/1 a=fmtp:18 annexb=no a=rtpmap:18 G729/8000/1 a=rtpmap:8 PCMA/8000/1 a=fmtp:18 annexb=no a=rtpmap:18 G729/8000/1 a=rtpmap:101 telephone-event/8000/1 a=sendrecv IVM -> PBX: v=0 o=NCHSoftware-IVM 1318295087 1318295092 IN IP4 s=IVM Answering Attendant Call c=IN IP4 t=0 0 m=audio 8000 RTP/AVP 0 8 101 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=sendrecv a=direction:active Since the uplink provider asks for g711a and receives g711u, the remote end hears nothing coming from the IVM. Is there any way to fix this ?
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