Re: [Asterisk-Users] unsolicited NOTIFY messages from Asterisk

Tue, 19 Jul 2005 23:23:16 -0700

Olle E. Johansson wrote: 
Chris A. Icide wrote:
  
Note however, that in the unsolicited NOTIFY that Asterisk sends for
MWI, it includes a ;tag= as part of the NOTIFY.  This will break some
devices as they will not accept the NOTIFY because the tag doesn't match
any transaction that is open.  The correct way to send an unsolicited
NOTIFY would be without the tag altogether.
    

That's interesting. Any suggestions on such a device? I haven't seen that.

I guess if they do that, it's ok, since sending unsolicited NOTIFY is
theoretically wrong anyway. If the phone software wants to support it,
they wouldn't bother with the tag, I guess.

/O
_______________________________________________
Asterisk-Users mailing list
[email protected]
http://lists.digium.com/mailman/listinfo/asterisk-users
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users
Olle,

Yes, a Metaswitch softswitch (and I suspect some other softswitches would as well).  It returns a 403 error if you send a NOTIFY for MWI to it with a tag attached.

This is a little different implementation.  The Metaswitch is providing the end user (over PSTN) service, and when a phone goes unanswered, it sends a the call to asterisk over sip.  I extract the phone number that was originally dialed from the SIP Header using the dialplan command for reading sip header messages, and send the call to voicemail.  Now I have to send back indication that a message exists.

Since the Metaswitch isn't sending a subscribe for every single line, we have a push model.  So we push out MWI, but Asterisk tags the push, and the Metaswitch rejects it since it has no previous transaction with a matching tag.

I patched the code so it won't send a tag on an MWI Notify for my own use, but it's specific to this implementation and would cause problems where a subscribe has been sent.

-Chris
_______________________________________________
Asterisk-Users mailing list
[email protected]
http://lists.digium.com/mailman/listinfo/asterisk-users
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

Reply via email to