[Freeswitch-users] Custom SIP Notify via proxy

[Neil Burgess]

Hello,



Sent this post a couple of weeks back. Still trying to find a solution, so

trying again and see if anyone has any thoughts!



I am trying to send CUSTOM NOTIFY events to devices, using the ESL interface

with a PHP script of the following form. I am having partial success, but

coming up against problems when using with an outbound SIP proxy:-



       $e = new ESLevent("NOTIFY");

       $e->addHeader("profile", "internal");

      $e->addHeader("from", "1020");

      $e->addHeader("to-uri", "sip:1019 at 192.168.2.3:5063;fs_path=sip:82.24.214.226:5063");

      $e->addHeader("from-uri", "sip:1020 at pbx.rm.com");

      $e->addHeader("host", "pbx.rm.com");

      $e->addHeader("event-string", "check-sync");

      $e->addHeader("content-type", "application/simple-message-summary");

      $e->addBody("ok");

      $res = $sockFSServerCommand->sendEvent($e);



In our setup, we have several FreeSwitch boxes sitting behind two OpenSIPS load

balancers. These Load Balancers handle registrations, etc. When we originate

calls from FreeSwitch, we use an originate URL of the form

(sofia/internal/1001 at sip.redmatter.com;fs_path=sip:84.45.30.2<mailto:sofia/internal/1001 at sip.redmatter.com;fs_path=sip:84.45.30.2>),

and use fs_path to push the sip call out via the right load balancer/ proxy.

This works perfectly.



So, with the custom NOTIFY's I also need to make them follow the same path.

As mentioned, we already have the contact string in our hand from the OpenSIPS

registration server, but can't see how I can use that plus force the outbound

path for the Notify. Was thinking I could use fs_path in the uri (as above)

but doesn't seem to work, i.e. the wrong IP is used, and NOTIFY is messed

up somewhat (see example below)! Maybe another combination I am missing!



------------------------

NOTIFY sip:1019 at 192.168.2.3:5063;fs_path=sip:82.24.214.22:5063 SIP/2.0

Via: SIP/2.0/UDP 212.85.24.245;rport;branch=z9hG4bKv268QHcy539yc

Max-Forwards: 70

From: <sip:1020 at pbx.rm.com>;tag=0rer8BS2etmmc

To: <sip:1019 at 192.168.2.3:5063>;fs_path=sip:82.24.214.22:5063

Call-ID: 5a08d5c6-1a8e-122e-3885-0024e86c401a

CSeq: 134921 NOTIFY

Contact: <sip:mod_sofia at 212.85.24.245:5060>

User-Agent: FreeSWITCH-mod_sofia/1.0.5-20100211-0400-16602

Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE

Supported: precondition, path, replaces

Event: check-sync

Allow-Events: talk, presence, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

Subscription-State: terminated;reason=timeout

Content-Type: application/simple-message-summary

Content-Length: 2



ok

------------------



Any thoughts gratefully appreciated.



Rgds,

Neil

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