[SR-Users] kamailio - proxy/relay

[Daniel-Constantin Mierla]

Hello,

On 7/5/11 8:46 PM, Sunny wrote:
> Hi list,
>
> I'm trying to configure kamailio to work as a OBP (Outbound Proxy).
>
> Basically KAMAILIO receive requests from UAs, after that it acts like 
> a client and send those requests to the IP-PBX.
> On the same way the responses are forwarded from IP-PBX to the UAs.
>
>
> [UA] --> [KAMAILIO] --> [IP-PBX  ]
> [UA] <-- [KAMAILIO] <-- [IP-PBX  ]
>
> Following possible call flow:
>
> [UA      ] -> [KAMAILIO] SIP/SDP Request: INVITE 
> sip:12345678909@[KAMAILIO], with session description
> [KAMAILIO] -> [UA      ] SIP Status: 100 Trying
> [KAMAILIO] -> [IP-PBX  ] SIP/SDP Request: INVITE 
> sip:12345678909@[IP-PBX  ], with session description
> [IP-PBX  ] -> [KAMAILIO] SIP Status: 100 Trying
> [IP-PBX  ] -> [KAMAILIO] SIP Status: 407 Proxy Authentication Required
> [KAMAILIO] -> [IP-PBX  ] SIP Request: ACK sip:12345678909@[IP-PBX  ]
> [KAMAILIO] -> [UA      ] SIP Status: 407 Proxy Authentication Required
> [UA      ] -> [KAMAILIO] SIP Request: ACK sip:12345678909@[KAMAILIO]
> [UA      ] -> [KAMAILIO] SIP/SDP Request: INVITE 
> sip:12345678909@[KAMAILIO], with session description
> [KAMAILIO] -> [UA      ] SIP Status: 100 Trying
> [KAMAILIO] -> [IP-PBX  ] SIP/SDP Request: INVITE 
> sip:12345678909@[IP-PBX  ], with session description
> [IP-PBX  ] -> [KAMAILIO] SIP Status: 100 Trying
> [IP-PBX  ] -> [KAMAILIO] SIP/SDP Status: 183 Session Progress, with 
> session description
> [KAMAILIO] -> [UA      ] SIP/SDP Status: 183 Session Progress, with 
> session description
> [IP-PBX  ] -> [KAMAILIO] SIP/SDP Status: 180 Ringing, with session 
> description
> [KAMAILIO] -> [UA      ] SIP/SDP Status: 180 Ringing, with session 
> description
> (...)
> [UA      ] -> [KAMAILIO] SIP Request: CANCEL sip:12345678909@[KAMAILIO]
> [KAMAILIO] -> [UA      ] SIP Status: 200 OK
> [KAMAILIO] -> [IP-PBX  ] SIP Request: CANCEL sip:12345678909@[IP-PBX  ]
> [IP-PBX  ] -> [KAMAILIO] SIP Status: 200 OK
> [IP-PBX  ] -> [KAMAILIO] SIP Status: 487 Request Terminated
> [KAMAILIO] -> [IP-PBX  ] SIP Request: ACK sip:12345678909@[IP-PBX  ]
> [KAMAILIO] -> [UA      ] SIP Status: 487 Request Terminated
> [UA      ] -> [KAMAILIO] SIP Request: ACK sip:12345678909@[KAMAILIO]
>
> Wondering if anyone could help to make this configuration work?

what I understood from above is that you need to update the domain in 
R-URI from [kamailio] to [ip-pbx]. This is easy to do:

$rd = [ip-pbx];

You have to do this for initial requests (register, invite).

If you need to update From header URI, look at uac module, 
uac_replace_from().

Cheers,
Daniel

-- 
Daniel-Constantin Mierla -- http://www.asipto.com
Kamailio Advanced Training, Oct 10-13, Berlin: http://asipto.com/u/kat
http://linkedin.com/in/miconda -- http://twitter.com/miconda