June 2009
Intermediate to advanced
880 pages
25h 35m
English
book
Microsoft® Office Communications Server 2007 R2 Resource Kit
by Rui Maximo, Rick Kingslan, Rajesh Ramanathan, Nirav Kamdar
Content preview from Microsoft® Office Communications Server 2007 R2 Resource Kit
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Bridging VoIP to the PSTN Network by Using a Media Gateway
For voice calls from Office Communications Server to reach the PSTN, a third-party media gateway is required to bridge the IP network and the PSTN network by translating the signaling and media to the protocols used by each network, as shown in Table 4-3.
Table 4-3. Protocol Translation That Media Gateway Performs
TECHNOLOGY | PSTN NETWORK | IP NETWORK |
|---|---|---|
Signaling protocol | SS7 and others | SIP |
Media codecs | G.711 | RTAudio (Real-Time Audio) |
Transport protocol | T-Carrier/E-Carrier | RTP (Real-Time Transport Protocol/SRTP (Secure RTP) |
Network type | Circuit switched | Packet-based |
Microsoft partners provide such a media gateway. (See the section titled "Additional Resources" at the end of this chapter for the link.) The three ...
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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.
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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.