[OpenSIPS-Users] 183 with SDP causes me grief

[Doug]

Hi All,

I am hoping you can shed some light into a difficult spot I'm having.

Currently, my one supplier is sending back Early Media (183 + SDP) when 
there is a problem (such as number not available), instead of a SIP 
response code. This in turn causes grief, as my system passes this 
session onto the client.

I wanted to know if its possible in the event of receiving a 183 from 
this specific supplier, to reply with a CANCEL and then engage a new 
route, or to send a 50x back to the client.

Based on the above, I am guessing I need to use the b2bua module, 
however, I don't see a way to identify a reply from the server id with a 
183:

I had something like this in mind:

<rules>
<reply>
<183>
<rule id="1">
<condition>
<state>1</state>
<sender>
<type>server</type>
<id>server1</id>
</sender>
</condition>
<action>
<send_reply>
<code>CANCEL</code>
<reason></reason>
</send_reply>
             ...
</action>
</rule>
</183>
</reply>
</rules>


Any suggestions if this is possible?

Many thanks
Doug