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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Call forwarding
Now, we will work with call forwarding on OpenSIPS. There are usually three kinds of call forwards:
- Call forward unconditional: The system redirects all the INVITE requests sent to this phone number to the phone stored in the
usr_preferencestable. The SIP server will simply replace the request URI before sending the request ahead. - Forward on busy: In this case, we will use the
failure_routefeature to intercept the 486 Busy Here message and create a new leg sending the INVITE request to the final destination. - Forward on no answer: If a phone replies to an INVITE request with a 480 Temporarily Unavailable or the SIP proxy generates a timeout with a 408 request Timeout, then OpenSIPS will again use
failure_routeto intercept the message ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.