Re: Siproxd uses random port to send SIP messages

Hi Christof,

I included your suggested change. However, it seems that sipgate.de
does not properly implement symmetric SIP signalling...

Symmetric SIP signalling is requested by a 'rport' parameter in the
topmost 'via' header - which siproxd does *NOT* include.

Details:
http://www.jdrosen.net/papers/draft-ietf-sip-symmetric-response-01.html

Anyhow, I hope now siproxd is more tolerant in this respect ;-)


Regards,
/Thomas


On  8 Feb, Christof Meerwald wrote:
> Hi,
> 
> I am unable to connect to sipgate.de via siproxd and I have tracked it down
> to a problem in siproxd: when siproxd forwards a SIP message it uses a
> random local port to send the UDP packet. sipgate.de seems to use this
> address to send replies to, but siproxd doesn't listen on this port and so
> the reply is lost.
> 
> Here is a tcpdump:
> 
> 14:21:57.348815 62.241.36.165.3769 > 217.10.79.9.5060:  udp 553 (DF)
> 14:21:57.358810 217.10.79.9.5060 > 62.241.36.165.3769:  udp 689 (DF) [tos 0x10]
> 14:22:01.275851 62.241.36.165.3769 > 217.10.79.9.5060:  udp 553 (DF)
> 14:22:01.285601 217.10.79.9.5060 > 62.241.36.165.3769:  udp 689 (DF) [tos 0x10]
> 14:22:05.320897 62.241.36.165.3769 > 217.10.79.9.5060:  udp 553 (DF)
> 14:22:05.331116 217.10.79.9.5060 > 62.241.36.165.3769:  udp 690 (DF) [tos 0x10]
> 14:22:09.306329 62.241.36.165.3769 > 217.10.79.9.5060:  udp 553 (DF)
> 14:22:09.317900 217.10.79.9.5060 > 62.241.36.165.3769:  udp 690 (DF) [tos 0x10]
> 
> As you can see, replies are sent to port 3769 on my machine, but siproxd
> doesn't expect replies to be sent to this port (it only listens on port 5060
> for replies).
> 
> 
> Fixing the problem is simple (use the same socket for sending and receiving
> SIP messages):
> 
> - remove the line "int sip_socket=0;" in src/siproxd.c
> - rename the "listen_socket" in src/sock.c to "sip_socket"
> 
> 
> bye, Christof
> 
> -- 
> http://cmeerw.org                                 JID: [email protected]
> mailto cmeerw at web.de
> 
> 
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