We are experiencing voice cutoff with SIP trunk. the scenario is, when making outbound call from an IP phone to PSTN phone, CCM delivers through SIP trunk to GW, when far side answers the call, the first or two words are always missing.
However when we set up H323 trunk, and send the same call through H323 trunk to the same GW, no voice cutoff.
So there is definitely fine tuning in SIP, does anyone recommend something in SIP trunk (CCM) or sip (GW)? Thanks.