January 2016
Intermediate to advanced
384 pages
8h 6m
English
book
Building Telephony Systems with OpenSIPS - Second Edition
by Flavio E. Goncalves, Flavio E Goncalves, Bogdan-Andrei Iancu
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Implementing call forward on busy or unanswered
Now, we will review an important concept called failure_route. We will handle the following failure situations:
- 408: Request Timeout (phone not registered or disconnected)
- 480: Temporarily Unavailable (no answer)
- 486: Busy Here
To implement call forward on busy and call forward when unanswered, we will use the concept of the failure route. In this logic, we will call the t_on_failure("missed_call") function just before sending the INVITE to the destination. This allows the handling of SIP negative replies (codes higher than 299).
We will use a logic similar to blind call forwarding; load an AVP to redirect the call to a specific URI as follows:
if(avp_db_load("$rU","$avp(fwdbusy)")) { $ru = $avp(fwdbusy); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.