
Chapter 6 Multisite WAN with Distributed Call Processing
Voice Messaging Considerations
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Cisco IP Telephony Network Design Guide
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configuration step, Cisco CallManager cannot automatically select the proper
transcoder, and the RTP stream will not complete transmission if the codecs are
mismatched.
Voice Messaging Considerations
In a multisite IP WAN with distributed call processing, each site must have its own
voice messaging components. This is the case whether using Cisco uOne or
interfacing to a legacy voice messaging system. See Figure 6-18.
Figure 6-18 WAN Cluster Voice Mail Placement
Voice/e-mail Voice/e-mail Directory Directory
Conf
MTP
Conf
MTP
Conf
MTP
Cisco uOne
application
server(s)
A
E
B
C
D
IP
IP
IP
IP
IP
IP
40810
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