I'm developing VOIP client application for S60 devices and having a problem in registering RTP/AVP Media type.INVITE request is failing as i'm getting "415, unsupported media type". I spent good time in googling and found the mentioned below workaround at Nokia technical Library site.
One can use a unique Accept-Contact header (but the same RTP/AVP media type) in the SIP message. Ideally, the Accept-Contact header is a better way of resolving the client as it can always be unique. This will route the messages to the correct applications. The problem that can arise from using this workaround solution is that a non-standard SIP message is being used.
What i've done:
Now Accept-Contact header is included in INVITE request and my opaque_data setting in resolve plugin is like this ....