[RTPproxy Users] rtpproxy failing handling re-invite

[Jörgen Andersson]

Helo all.

I have ran openser and rtpproxy for over a year now and it works  
really well. Now we have installed a dect system that are getting me  
really confused. The calls connects and the audio are really fine.  
When you change base on the dect system, the dect system sends a re- 
invite via openser that we proxy and on to our broadworks switchboard.  
It all works really fine until we get a re-invite from the same baseip  
that the dect device are connected on. the only thing that are changed  
in the re-invite are the port.

Here are the first invite:

INVITE sip:28202 at customer.com SIP/2.0
Via: SIP/2.0/UDP 172.22.133.62;branch=z9hG4bK6906orkakq2u2ou
Max-Forwards: 70
From: "userid" <sip:userid at customer.com>;tag=kpgp6s6skgjr
To: <sip:28202 at customer.com>
Call-ID: lsvcr9n0jez.bz6t5d8xllk at customer.com
CSeq: 22117 INVITE
Contact: <sip:userid at 172.22.133.62:5060>
Allow: INVITE, CANCEL, BYE, ACK, REGISTER, OPTIONS, REFER, SUBSCRIBE,  
NOTIFY, MESSAGE, INFO
Content-Disposition: session
Supported: 100rel
User-Agent: ipdect-ua/v0215
Content-Type: application/sdp
Content-Length: 166

v=0
o=userid 1325855993 1325855993 IN IP4 193.235.154.210
s=-
c=IN IP4 193.235.154.210
t=0 0
m=audio 5154 RTP/AVP 8
a=rtpmap:8 PCMA/8000/1
a=ptime:20


the audio are now sent to 193.235.154.210 on port 5154. everything is  
working fine.


re-invite:

INVITE sip:80.72.7.184:5060 SIP/2.0
Via: SIP/2.0/UDP 172.22.133.62;branch=z9hG4bKc79btnsgwqf.4fin2z7x2p
Max-Forwards: 70
From: "userid" <sip:userid at customer.com>;tag=kpgp6s6skgjr
To: <sip:28202 at customer.com>;tag=1201581141-1248716281294
Call-ID: lsvcr9n0jez.bz6t5d8xllk at customer.com
CSeq: 22118 INVITE
Contact: <sip:userid at 172.22.133.62:5060>
Allow: INVITE, CANCEL, BYE, ACK, REGISTER, OPTIONS, REFER, SUBSCRIBE,  
NOTIFY, MESSAGE, INFO
Content-Disposition: session
Route: <sip:172.22.133.21;lr=on;ftag=kpgp6s6skgjr>,<sip:80.72.7.200;lr=on;ftag=kpgp6s6skgjr 
 >
User-Agent: ipdect-ua/v0215
Content-Type: application/sdp
Content-Length: 166

v=0
o=userid 1325855993 1325855994 IN IP4 193.235.154.210
s=-
c=IN IP4 193.235.154.210
t=0 0
m=audio 5054 RTP/AVP 8
a=rtpmap:8 PCMA/8000/1
a=ptime:20


the audio should be sent to port 5054 but rtpproxy still sends it to  
port 5154.

the only thing that are changed in the sdp information are version  
number and port number.


here are whats configurated in openser regarding re-invites:

                                 if(is_method("INVITE")){
                                         if(has_body("application/ 
sdp")){
                                                 xlog("Forcing rtp  
proxy on request");
                                                 force_rtp_proxy("acr");
                                                 resetflag(20);
                                         }else{
                                                 xlog("Forcing rtp  
proxy on 200 - ACK");
                                                 setflag(20);
                                         }
                                 }

have i missed out something regarding the force_rtp_proxy?

br

Jörgen