RE: [Serusers] rtpproxy with parallel forking - sr-users

5 Aug 2004

Hi Richard,

I'm experiencing similar problems..

NATPhone  -------------- SER ------------------- Public phone

the Ser-server has a public ip-address. They both register fine but
when I make a call from the natphone to the publicPhone the public
phone can hear my voice but I can't hear the publicPhone.
INVITE from the log file:

SIP/2.0 200 OK^M
Via: SIP/2.0/UDP 10.0.0.2:5070;received=213.219.137.171;rport=5070^M
Supported: replaces^M
User-Agent: SIP201 (lp201sip.100a)^M
Contact: <sip:joachim@212.71.17.178:5070>^M
Record-Route:
<sip:1@212.71.0.60:5070;lr;ftag=a000002-13ce-41123427-943ea0-4d15>^M
From: <sip:bart@ser.edpnet.net:5070>
;tag=a000002-13ce-41123427-943ea0-4d15^M
To: <sip:1@ser.edpnet.net:5070;user=phone>
;tag=d44711b2-13ce-1135c2-433a03fc-1d24^M
Call-ID: 522c24-a000002-13ce-41123427-943e9b-28ff(a)ser.edpnet.net^M
CSeq: 1 INVITE^M
Content-Type: application/sdp^M
Content-Length:158^M
^M
v=0^M
o=SIP201 12367 0 IN IP4 212.71.17.178^M
s=Audio Session^M
i=Audio Session^M
c=IN IP4 212.71.17.178^M
t=0 0^M
m=audio 16384 RTP/AVP 4^M
a=rtpmap:4 G723/8000/1^M

When I make a Call from the PublicPhone to the natPhone We both don't
hear a thing and the INVITE is like this:
SIP/2.0 200 OK^M
Via: SIP/2.0/UDP 212.71.17.178:5070^M
Supported: replaces^M
User-Agent: SIP201 (lp201sip.100a)^M
Contact: <sip:bart@10.0.0.2:5070>^M
Record-Route:
<sip:2@212.71.0.60:5070;lr;ftag=d44711b2-13ce-113882-4344c26a-146f>^M
From: <sip:joachim@ser.edpnet.net:5070>
;tag=d44711b2-13ce-113882-4344c26a-146f^M
To: <sip:2@ser.edpnet.net:5070;user=phone>
;tag=a000002-13ce-411236e9-9f0123-31fd^M
Call-ID: 522dc4-d44711b2-13ce-113882-4344c265-649(a)ser.edpnet.net^M
CSeq: 1 INVITE^M
Content-Type: application/sdp^M
Content-Length:148^M
^M
v=0^M
o=SIP201 12367 0 IN IP4 10.0.0.2^M
s=Audio Session^M
i=Audio Session^M
c=IN IP4 10.0.0.2^M
t=0 0^M
m=audio 16384 RTP/AVP 4^M
a=rtpmap:4 G723/8000/1^M

Is this because there's a private address (10.0.0.2) in the sipmessage?

thanks,
Bart

...
  -----Original Message-----
 From: Richard [mailto:mypop3mail@yahoo.com] 
 Sent: woensdag 4 augustus 2004 12:15
 To: serusers(a)lists.iptel.org
 Subject: [Serusers] rtpproxy with parallel forking

 Hi,

 When I have one phone behind NAT, rtpproxy works well.

 However if a call goes to two phones (one behind NAT and one 
 not) and ser (or more precisely cpl-c) does parallel forking, 
 the call can go through but there is no voice on either 
 direction. I have a modparam("cpl-c", "proxy_route", 2) and 
 route(2) calls force_rtp_proxy().

 Has anyone tried this before? Is rtpproxy capable to handle 
 multiple forked calls?

 Thanks,
 Richard

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