July 2002
Intermediate to advanced
528 pages
15h 13m
English
Content preview from Practical VoIP Using VOCALBecome 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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MGCP Translator
The MGCP translator acts as a SIP User Agent that talks SIP to a SIP proxy on one side and acts as an MGCP Call Agent (CA) that speaks MGCP to control MGCP gateways on the other side. This allows MGCP gateways to be controlled by the MGCP translator’s CA, but servers within the SIP world control the routing decision. A call can be made from an MGCP gateway to a SIP entity or from a SIP entity to an MGCP gateway. A call may also be made from an MGCP gateway back to the same MGCP translator via a network of SIP servers, which in turn will attempt to contact another or the same MGCP gateway.
Although two MGCP connections can be made through the same CA and gateway, the translator sends all messages through to the VOCAL network. There is no hairpinning permitted through the translator (where the signal receives responses from the translator without the participation of the VOCAL servers).
The translator sends SIP registration messages on behalf of all the endpoints it controls. It can make outgoing SIP calls and terminate incoming SIP calls on the MGCP gateways. Besides basic calls, it supports transfer, conference, and call waiting. It has limited redundancy support: the backup MGCP translator is able to support connected calls from a failover. For most of these features , detailed call flow diagrams later in this chapter illustrate their operation.
- Startup and registering
The MGCP translator sends SIP REGISTER messages on behalf of all the MGCP endpoints that ...
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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.
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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.