Hello,
for dialogs (like subscriptions or invites), you have to use record routing (see rr module) -- so for initial subscribe/invite you have to add record-route header in kamailio, then do loose routing for requests within the dialog (like notify) -- the default config file coming with kamailio has such logic there.
For registrations, I would suggest the usage of Path extensions, which is an ietf rfc, but the registrar server has to support that (avaya sip server in your case). Alternative will be to replace the contact in register (you can do it for subscribe as well) requests with ip of kamailio and a parameter that encodes the nat box ip/port.
A similar mechanism is used by add_contact_alias() function from nathelper module to help going through nat -- you can actually use it in conjunction with record routing for invites/subscriptions.
Cheers, Daniel
On 7/19/12 1:12 PM, Martin Schiøtz wrote:
Hi
I'm trying to configure kamailio version 3.3.0 to be a Session Border Controller which only purpose is to handle far-end-nat.
On the far end site I have a SIP client with IP '192.168.1.2' which is NAT'ed to IP 'zz.zz.85.230'. The SIP ALG is disabled on the NAT firewall. The SIP client is communicating with the kamailio server and the Kamailio server is forwarding every thing to an Avaya SIP server 'xx.xx.173.15' and vice versa. The kamilio is konfigured to do this stateless.
The REGISTER and SUBSCRIBE part works fine. The kamailio is using the 'Via:' field and I also needed to do subst on the 'Contact:' field in order for our SIP server to communicate back to the kamailio. But when I get to the NOTIFY packet from the SIP server to the kamailio there is no 'Via:' field or any other information about the SIP clients IP/port and the Kamailio just sends back 'SIP/2.0 404 Not here.' to the SIP server.
I guess that this can not be solved with a statless kamailio? I guess that I need some kind of state table in the kamailio - is that possible without doing REGISTER directly with the kamailio? Any other good ideas are welcome?
Cheers, Martin
Tell me if need more info the issue?
# T xx.xx.173.15:38059 -> yy.yy.159.211:5060 [AP] NOTIFY sip:2001012@yy.yy.159.211:5060;transport=TCP SIP/2.0. Call-ID: NjQ5ZDNlYzRjOWFjMzMzN2JlYzAwMTg4ODYwZTJlYWY.. From: "2001012" sip:2001012@bsosip.domain.dk;tag=-667195155*1*016asm-callprocessing.sar229435981~1342570131099~1170998434~1. To: "2001012" sip:2001012@bsosip.domain.dk;tag=7ca0af7d. CSeq: 3 NOTIFY. Contact: sip:xx.xx.173.14:15060. Via: SIP/2.0/TCP xx.xx.173.15;branch=z9hG4bK4DEAAD0E478B838008189457-AP;ft=xx.xx.173.15~13c4. Via: SIP/2.0/UDP xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838008189457. Via: SIP/2.0/TCP xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838018189455. Event: message-summary. Content-Type: application/simple-message-summary. Content-Length: 69. Subscription-State: active;expires=299. Max-Forwards: 68. User-Agent: AVAYA-SM-6.1.4.0.614005. . Messages-Waiting: no. Message-Account: sip:2001012@bsosip.domain.dk.
## T yy.yy.159.211:5060 -> xx.xx.173.15:38059 [AP] SIP/2.0 404 Not here. Call-ID: NjQ5ZDNlYzRjOWFjMzMzN2JlYzAwMTg4ODYwZTJlYWY.. From: "2001012" sip:2001012@bsosip.domain.dk;tag=-667195155*1*016asm-callprocessing.sar229435981~1342570131099~1170998434~1. To: "2001012" sip:2001012@bsosip.domain.dk;tag=7ca0af7d. CSeq: 3 NOTIFY. Via: SIP/2.0/TCP xx.xx.173.15;branch=z9hG4bK4DEAAD0E478B838008189457-AP;ft=xx.xx.173.15~13c4;rport=38059. Via: SIP/2.0/UDP xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838008189457. Via: SIP/2.0/TCP xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838018189455. Server: kamailio (3.3.0 (i386/linux)). Content-Length: 0. .
# T xx.xx.173.15:38059 -> yy.yy.159.211:5060 [A] ...... # T yy.yy.159.211:5060 -> xx.xx.173.15:38059 [AP] SIP/2.0 404 Not here. Call-ID: NjQ5ZDNlYzRjOWFjMzMzN2JlYzAwMTg4ODYwZTJlYWY.. From: "2001012" sip:2001012@bsosip.domain.dk;tag=-667195155*1*016asm-callprocessing.sar229435981~1342570131099~1170998434~1. To: "2001012" sip:2001012@bsosip.domain.dk;tag=7ca0af7d. CSeq: 3 NOTIFY. Via: SIP/2.0/TCP xx.xx.173.15;rport=38059;branch=z9hG4bK4DEAAD0E478B838008189457-AP;ft=xx.xx.173.15~13c4. Via: SIP/2.0/UDP xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838008189457. Via: SIP/2.0/TCP xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838018189455. Server: kamailio (3.3.0 (i386/linux)). Content-Length: 0.
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