
Chapter 9 Catalyst DSP Provisioning
Catalyst MTP Transcoding Services
9-10
Cisco IP Telephony Network Design Guide
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Figure 9-3 Multisite WAN Using Centralized MTP Transcoding and
Conferencing Services
IP-to-IP Packet Transcoding Across Intercluster Trunks
H.323v2 Intercluster Trunks are used to connect Cisco CallManager clusters. If
transcoding services are needed between clusters, the Intercluster trunks are
configured with MTP. In this case, all calls between clusters are routed through
the MTP/transcoding devices in each cluster. For the Catalyst 6000 module, the
MTP service is used regardless of whether transcoding is needed for that
particular intercluster call or not. Unlike previous versions,
Cisco CallManager Release 3.0 (and later) supports compressed voice call
connection through the MTP service if a hardware MTP is used. Figure 9-4 shows
an intercluster call flow.
IP WAN
Compressed Call Leg
G.711 Call Leg
DSP Farm
Cisco
CallManager
A
Voice mail
server
G.711 only
IP
IP
IP
IP
VSM
VSM
Transcoding
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