Hi Everyone. I have been trying to get 3cx working with TeliaSonera SIP Trunk and have run into a couple of problems. Calls work fine when calling outbounds from 3cx, but with incoming calls there seems to be some oddities with SIP signalling: When trying to answer the call 3cx sends m: audio 0 RTP/AVP back in the 200 OK message towards the trunk which means it does not declare any working codec which causes the TRUNK to discard the call. I noticed that in SDP of the SIP INVITE from the trunk the DynamicRTP-Type is 100 and repectively in a INVITE from 3cx towards the trunk the aforementioned value is 101. Could it be that 3cx just simply does not understand the INVITE if DynamicRTP-type is something else than 101??? Any help regarding this? 3cx version is 12 with the latest service packs installed.