Hello! I am trying to make a call using codec g729,but repeatedly i was getting the error of codec negotiation.However,i have resolved it. Although it offers a list of codec with different payloads for the same codec but it does not match with other audio codec.I have to match the audio codec g729 with the other one. Here are few relevant lines of the log: Local SDP: v=0 o=FreeSWITCH 1551144396 1551144397 IN IP4 192.168.1.123 s=FreeSWITCH c=IN IP4 192.168.1.123 t=0 0 m=audio 22412 RTP/AVP 0 18 102 9 8 101 104 a=rtpmap:0 PCMU/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:102 opus/48000/2 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMU:0:8000:20:64000:1]/[PCMU:0:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4504 Audio Codec Compare [PCMU:0:8000:20:64000:1] ++++ is saved as a match 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMU:0:8000:20:64000:1]/[G729:18:8000:20:8000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMU:0:8000:20:64000:1]/[opus:116:48000:20:0:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMU:0:8000:20:64000:1]/[G722:9:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMU:0:8000:20:64000:1]/[PCMA:8:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [GSM:3:8000:20:13200:1]/[PCMU:0:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [GSM:3:8000:20:13200:1]/[G729:18:8000:20:8000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [GSM:3:8000:20:13200:1]/[opus:116:48000:20:0:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [GSM:3:8000:20:13200:1]/[G722:9:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [GSM:3:8000:20:13200:1]/[PCMA:8:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [speex:110:8000:20:0:1]/[PCMU:0:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [speex:110:8000:20:0:1]/[G729:18:8000:20:8000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [speex:110:8000:20:0:1]/[opus:116:48000:20:0:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [speex:110:8000:20:0:1]/[G722:9:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [speex:110:8000:20:0:1]/[PCMA:8:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[PCMU:0:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[G729:18:8000:20:8000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[opus:116:48000:20:0:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[G722:9:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[PCMA:8:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4504 Audio Codec Compare [PCMA:8:8000:20:64000:1] ++++ is saved as a match 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [iLBC:98:8000:30:0:1]/[PCMU:0:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [iLBC:98:8000:30:0:1]/[G729:18:8000:20:8000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [iLBC:98:8000:30:0:1]/[opus:116:48000:20:0:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [iLBC:98:8000:30:0:1]/[G722:9:8000:20:64000:1] 2019-02-26 02:40:10.077544 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [iLBC:98:8000:30:0:1]/[PCMA:8:8000:20:64000:1] Can anyone please point,how to resolve it? Thanks. -- Sent from: http://freeswitch-users.2379917.n2.nabble.com/