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
Content preview from Building Telephony Systems with OpenSIPS - Second Edition
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Solving the SIP NAT traversal challenge
There are many ways to solve the NAT puzzle with many different types of NAT. So, for a beginner, the problem becomes very confusing We will see a table with the following valid methods of solving SIP for the NAT issue:
- STUN: Simple traversal of UDP over NAT
- TURN: Traversal of UDP over Relay NAT
- ALG: Application Layer Gateways
- MANUAL: Manual configuration (port forwarding)
- UPNP: Universal Plug and Play
|
Method |
STUN |
TURN |
ALG |
MANUAL |
UPNP |
|---|---|---|---|---|---|
|
Symmetric NAT |
No |
Yes |
Yes |
Yes |
Yes |
|
It requires phone support? |
Yes |
No |
No |
No |
No |
|
Scalability |
Good |
Poor |
Good |
Good |
Good |
|
User effort |
Small |
Small |
Small |
High |
Small |
|
Reliability |
Good |
Good |
Poor |
Good |
? |
|
Industry support |
Good |
Good |
Average |
Good |
Poor |
Most ...
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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.