I have two types of devices, one supports text/html MESSAGE content and one that only supports text/plain MESSAGE content. When I send an IM from the first to the second, the second replies with 415 Unsupported Media Type (as shown below). Section 8.1.3.5 of RFC 3261 says the sender should retry using the media type acceptable to the receiver (in this case: plain/text). The problem I have is that Freeswitch doesn't pass the error back to the sender (nor does it retry itself using plain/text). So the IM is lost. Does anyone see the reason why the error is not being handled correctly? ------------------------------------------------------------------------ send 668 bytes to udp/[192.168.72.141]:5062 at 18:43:24.720446: ------------------------------------------------------------------------ MESSAGE sip:5398@192.168.72.141:5062 SIP/2.0 Via: SIP/2.0/UDP 192.168.72.141;rport;branch=z9hG4bKXg6SNUcQa5Kre Max-Forwards: 70 From: "5382 on 141" <sip:5382@192.168.72.141>;tag=66661130 To: "5398" <sip:5398@192.168.72.141:5062> Call-ID: a9891a15-9da9-122d-b3ad-003048d7e9f0 CSeq: 127444135 MESSAGE Contact: <sip:mod_sofia@192.168.72.141:5060> User-Agent: FreeSWITCH-mod_sofia/1.0.trunk-32M Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE Supported: timer, precondition, path, replaces Content-Type: text/html Content-Length: 63 <font size="2" face="Arial">hello this is Jerry from Teo</font> ------------------------------------------------------------------------ recv 459 bytes from udp/[192.168.72.141]:5062 at 18:43:24.728390: ------------------------------------------------------------------------ SIP/2.0 415 Unsupported media type Via: SIP/2.0/UDP 192.168.72.141;rport=5060;branch=z9hG4bKXg6SNUcQa5Kre;received=192.168.72.14 1 From: "5382 on 141" <sip:5382@192.168.72.141>;tag=66661130 To: "5398" <sip:5398@192.168.72.141:5062> Call-ID: a9891a15-9da9-122d-b3ad-003048d7e9f0 CSeq: 127444135 MESSAGE Date: Fri, 26 Feb 2010 18:43:24 GMT User-Agent: MobilityGateway-2.0.34078 Server: MobilityGateway-2.0.34078 Accept: text/plain Content-Length: 0 Best Regards, Jerry