Hi I wonder if anybody can help. We are getting an error creeping in on a production system. It is happening randomly which of course makes it difficult to track down. A call to a SIP registered endpoint (VoIP handset) randomly fails, it rings, then when it is answered the call fails. It could be to any of the end points on our system, it doesn't happen every call, in fact it only happens on prepositionally very few calls. If we restart the Freeswitch service the frequency of calls effected reduces to nothing and then builds up again. Logs show (I have replaced our IP address with {IP ADDRESS}) freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 2019-11-08 10:01:02.857442 [DEBUG] mod_sofia.c:646 SOFIA EXCHANGE_MEDIA freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 2019-11-08 10:01:02.897441 [ERR] switch_core_media.c:15418 sofia/internal/5033305@{IP ADDRESS}:38532 has no write codec. freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 2019-11-08 10:01:02.897441 [NOTICE] switch_core_media.c:15419 Hangup sofia/internal/5033305@{IP ADDRESS}:38532 [CS_EXCHANGE_MEDIA] [INCOMPATIBLE_DESTINATION] freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 2019-11-08 10:01:02.897441 [DEBUG] switch_ivr_bridge.c:1881 sofia/internal/5033305@{IP ADDRESS}:38532 skip receive message [UNBRIDGE] (channel is hungup already) freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 2019-11-08 10:01:02.837454 [DEBUG] sofia.c:7301 Remote SDP: freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 v=0 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 o=5033305 38480 137 IN IP4 51.148.123.105 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 s=Mapping freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 c=IN IP4 51.148.123.105 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 t=0 0 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 m=audio 38480 RTP/AVP 0 101 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=rtpmap:0 PCMU/8000 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=rtpmap:101 telephone-event/8000 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=fmtp:101 0-16 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=ptime:20 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 Local SDP: freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 v=0 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 o=FreeSWITCH 1573174674 1573174675 IN IP4 178.128.173.117 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 s=FreeSWITCH freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 c=IN IP4 178.128.173.117 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 t=0 0 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 m=audio 32570 RTP/AVP 0 101 13 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=rtpmap:0 PCMU/8000 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=rtpmap:101 telephone-event/8000 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=fmtp:101 0-16 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=rtpmap:13 CN/8000 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=ptime:20 freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 a=sendrecv freeswitch.log.2019-11-08-10-15-53.1:7ea8711f-40c3-4cfc-b927-fc99fc9b7437 Any ideas would be appreciated. David J Dean