Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 194

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Chapter 9 Catalyst DSP Provisioning
Catalyst MTP Transcoding Services
9-8
Cisco IP Telephony Network Design Guide
78-11103-03
functionality has been added to two of the new modules for the Catalyst 4000 and
Catalyst 6000. A packet-to-packet gateway is a device with DSPs that has the job
of transcoding between voice streams using different compression algorithms.
That is, when a user on an IP phone at a remote location calls a user at the central
location, Cisco CallManager instructs the remote IP phone to use compressed
voice, or G.729a, only for the WAN call. However, if the called party at the central
site is unavailable, the call potentially rolls to an application that supports G.711
only. In this case, a packet-to-packet gateway transcodes the G.729a voice stream
to G.711 to leave a message with the voice messaging server. See Figure 9-2.
Figure 9-2 IP-to-IP Packet Gateway Transcoding for the WAN with Centralized Call Processing
Site 1
IP WAN
x1111
x1112
x2112
Cisco 7200
Cisco 1750
Site 2
MTP
Skinny Station Protocol
G.711 voice stream
G.729a voice stream
MTP transcoding
DSP farm
=
MTP
x2111
IP
IP
IP
IP
40828
Voice mail
server
Cisco
CallManager
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