July 2017
Intermediate to advanced
434 pages
12h 59m
English
Content preview from FreeSWITCH 1.8
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SIP DID from World to the ITSP to Us
A DID (Direct Inward Calling) number is a phone number that in some way when it is called then originates a SIP call toward a SIP server (the SIP server, in our case FreeSWITCH, will then route the call to its final destination, often an extension phone).
The logical flow is: CALLER -> PSTN -> DID -> ITSP -> SIP -> FreeSWITCH
There are many DIDs providers, maybe the most known pure DID provider is DIDx.net, that can provide local numbers from all around the world. Many ITSPs also can lease you numbers, local to the country they are located and international numbers, and usually they get those numbers from upstream DID providers.
So, we buy (actually, lease, nobody can sell you the ownership of a phone ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.