[Serusers] UAC UDP to Proxy TCP... Problem

[Greger V. Teigre]

Seems like you have done your research and what you write seems reasonable. It's difficult to give you an answer without having a complete ngrep trace. However, you should also look at the Record-Route and Route headers...
g-)
  ----- Original Message ----- 
  From: Christian Thomas 
  To: serusers at lists.iptel.org 
  Sent: Tuesday, February 14, 2006 6:33 PM
  Subject: [Serusers] UAC UDP to Proxy TCP... Problem


  Hi everybody,

  I have a UDP2TCP problem with Ser. (0.9-4)
  The UACs connected to my SER Proxy are all UDP. When I use some carriers to connect them to PSTN The Carrier Proxy / GW could talk UDP or TCP. It depends on the destination.
  Each time the Carrier GW want to talk TCP, the contact field is correct and contains the 'transport=tcp' mention. all seems to be correct and, after a complete reading about this subject in the list, I trust that using t_relay() must do the right translation and send response via TCP to the Carrier GW when this one is transport=tcp declared.
  If I Check the message for an Ack or a BYE sent to the TCP GW the uri is correct :
  the transport=tcp is added. 
   Request-Line: ACK sip:50033299848400 at 200.1xx.xx.xx:5060;transport=tcp SIP/2.0
  I have red that this is sufficient to let SER understand that it must be sent via TCP.
  unfortunately, this message is ent thru UDP. 
  May I force with a t_relay_to_tcp ? As this case depends on the carrier dynamic routing  it could be complicated because of the need to know the destination to script t_relay_to_tco(uri, port)... If anybody has the trick or any advice...
  Other thing related, when TCP is the transport mode from the Carrier GW and I forward staefully to the UAC (Asterisk) the call failed between Asterisk as UAC and the carrier GW.
  I wondering it was because the Carrier Gw didn't receive an ACK TCP from my server..

  Well I'm completely lost... as you can feel with my message...
  I need Help.. But don't cal me Harry ;)

  Regards,

  Christian Thomas 



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