[OpenSIPS-Users] Protocol conversion - Double record route issue‏

[Hamid Hashmi]

Hi Bogdan
Yes, your guess is right. 
Opensips is listening on Private IP with advertise IP, which is an elastic IP. While A and B are on public internet.
Hamid R. HashmiSoftware Engineer - VoIPVopium A/S

Subject: Re: [OpenSIPS-Users] Protocol conversion - Double record route issue‏
To: users at lists.opensips.org; hamid2kviii at hotmail.com
From: bogdan at opensips.org
Date: Wed, 24 Feb 2016 00:31:56 +0200


  
    
  
  
    Hi Hamid,

      

      I guess both A and B are on the public internet communicating with
      your opensips via the elastic IP, right ? and your opensips is
      listening only on the private IP in EC2 ? do you use advertise ?

      

      Regards,

    
    Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com
    On 23.02.2016 07:33, Hamid Hashmi
      wrote:

    
    
      
      
        I am using opensips as an
          edge proxy on Amazon EC2 (server behind NAT) and it works fine
          if It only works on UDP or TCP. but if I need to translate
          from TCP -> UDP, ACK does not reach proxy server due to
          private IP in record-route. 
        

        
        EdgeProxy -> B# 
        

        
        
          INVITE sip:923003000200 at 182.185.200.42:46488;transport=tcp;line=fd2af176e9c88c3 SIP/2.0
Record-Route: <sip:52.76.50.195:6080;transport=tcp;r2=on;lr;ftag=ae2b3a03>
Record-Route: <sip:192.168.26.180:6080;r2=on;lr;ftag=ae2b3a03>
Record-Route: <sip:+923003000200 at 192.168.26.181:8000;lr;ftag=ae2b3a03;did=077.9923f675;nat=yes>
Record-Route: <sip:52.76.50.195:6080;r2=on;lr;ftag=ae2b3a03;EdgeProxy=true>
Record-Route: <sip:192.168.26.180:6080;transport=tcp;r2=on;lr;ftag=ae2b3a03;EdgeProxy=true>
Via: SIP/2.0/TCP 52.76.50.195:6080;branch=z9hG4bK4a7b.55d0e535.0
Via: SIP/2.0/UDP 192.168.26.181:8000;branch=z9hG4bK4a7b.0b4f27b4.0
Via: SIP/2.0/UDP 52.76.50.195:6080;rport=6080;received=192.168.26.180;branch=z9hG4bK4a7b.45d0e535.0;i=2
Via: SIP/2.0/TCP 103.255.5.24:47590;received=103.255.5.24;branch=z9hG4bK-524287-1---74668ff8d4027b7c;rport=47590
Max-Forwards: 67
Contact: <sip:923007777777 at 103.255.5.24:47590;transport=TCP>
To: <sip:+923003000200 at 52.76.50.195:6080;transport=TCP>
From: "+923007777777"<sip:+923007777777 at 52.76.50.195>;tag=ae2b3a03
        
        

        
        EdgeProxy -> A#
        

        
        
          SIP/2.0 200 OK
Via: SIP/2.0/TCP 192.168.10.13:6060;received=182.185.200.42;rport=47103;branch=z9hG4bK801489929
Record-Route: <sip:52.76.50.195:6080;transport=tcp;r2=on;lr;ftag=1252633513>
Record-Route: <sip:192.168.26.180:6080;r2=on;lr;ftag=1252633513>
Record-Route: <sip:+923007777777 at 192.168.26.181:8000;lr;ftag=1252633513;did=755.1859af64;nat=yes>
Record-Route: <sip:52.76.50.195:6080;r2=on;lr;ftag=1252633513;EdgeProxy=true>
Record-Route: <sip:192.168.26.180:6080;transport=tcp;r2=on;lr;ftag=1252633513;EdgeProxy=true>
Contact: <sip:923007777777 at 103.255.5.24:48469;transport=TCP>
To: <sip:+923007777777 at 52.76.50.195:6080>;tag=12b65b6d
From: <sip:923003000200 at 52.76.50.195:6080>;tag=1252633513
        
        

        
        A# -> EdgeProxy
        

        
        
          ACK sip:923007777777 at 103.255.5.24:48469;transport=TCP SIP/2.0
Via: SIP/2.0/TCP 192.168.10.13:6060;rport;branch=z9hG4bK184821964
Route: <sip:192.168.26.180:6080;transport=tcp;r2=on;lr;ftag=1252633513;EdgeProxy=true>
Route: <sip:52.76.50.195:6080;r2=on;lr;ftag=1252633513;EdgeProxy=true>
Route: <sip:+923007777777 at 192.168.26.181:8000;lr;ftag=1252633513;did=755.1859af64;nat=yes>
Route: <sip:192.168.26.180:6080;r2=on;lr;ftag=1252633513>
Route: <sip:52.76.50.195:6080;transport=tcp;r2=on;lr;ftag=1252633513>
From: <sip:923003000200 at 52.76.50.195:6080>;tag=1252633513
To: <sip:+923007777777 at 52.76.50.195:6080>;tag=12b65b6d
        
        

        
        
          Client send ACK to
            Private IP of Edge proxy. While it should send it to its
            Public IP.
          

          
          opensips inserts routes inversely
              incase of protocol translation. It should insert Double
              route with private IP first and public IP afterwards
              INSTEAD of public IP first for OUTBOUND INVITEs.
        
        

        Hamid
              R. Hashmi
        Software Engineer - VoIP
        Vopium
            A/S
      
      

      
      

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