Hi, I used FreeSWITCH Version 1.3.17+git~20130312T033518Z~7d29a92f55 and client could talk with G729 without problem. Today I install a new FS and the version is FreeSWITCH Version 1.5.1b+git~20130417T010754Z~538d9beacd. I copied the entire conf directory in old FS to new FS. I got the problem. 2013-04-18 21:25:06.899049 [DEBUG] sofia.c:5694 Remote SDP: v=0 o=Dialogic_SIP_CCLIB 62147888 62147889 IN IP4 10.0.110.41 s=Dialogic_SIP_CCLIB c=IN IP4 10.0.110.41 t=0 0 m=audio 49152 RTP/AVP 18 101 a=fmtp:18 annexb=no a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=ptime:30 2013-04-18 21:25:06.899049 [DEBUG] switch_core_media.c:2597 Audio Codec Compare [G729:18:8000:30:8000]/[G729:18:8000:20:8000] 2013-04-18 21:25:06.899049 [DEBUG] switch_core_media.c:2597 Audio Codec Compare [telephone-event:101:8000:30:0]/[G729:18:8000:20:8000] 2013-04-18 21:25:06.899049 [DEBUG] switch_core_media.c:2671 Substituting codec G729@30i@8000h 2013-04-18 21:25:06.899049 [DEBUG] switch_core_media.c:1617 No audio codec available 2013-04-18 21:25:06.899049 [DEBUG] switch_core_media.c:2752 Set 2833 dtmf send payload to 101 2013-04-18 21:25:06.899049 [NOTICE] sofia.c:5812 Hangup sofia/ivvr/9999110 [CS_CONSUME_MEDIA] [INCOMPATIBLE_DESTINATION] Any advice? Thanks. Jimmy