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Chapter 7 Multisite WAN with Centralized Call Processing

DSP Resource Provisioning for Transcoding and Conferencing

7-10

Cisco IP Telephony Network Design Guide

78-11103-03

DSP Resource Provisioning for Transcoding and

Conferencing

Centralized call processing is typically done in environments where the

provisioning of dedicated call processing at each site is not cost effective or is

administratively unacceptable. The benefits of such a configuration are its central

administration and low cost when spread across many sites. Digital signal

processor (DSP) resources are required for transcoding and conferencing of calls.

These resources are dedicated to each individual Cisco CallManager and must be

located at the aggregation site.

Figure 7-5 shows the allocation of DSP resources.

Figure 7-5 DSP Resource Allocation

The number of allocated resources is based upon the requirements for transcoding

to voice mail and transcoding to G.711 for other applications such as

conferencing. These numbers are calculated based upon the ratio of users to voice

mail ports and the volume of conference calls placed. In cases where the

placement of resources per Cisco CallManager is deemed cost prohibitive, the

resources could be statically moved within the WAN cluster in the event of failure

of the primary Cisco CallManager.

Figure 7-6 shows a centralized transcoding resource providing conversion from

G.729a or G.723.1 to G.711 when a call that was initially placed at G.729a or

G.723.1 rolls to voice mail, which is only a G.711 application.

Primary

Secondary

Cluster X

Location 1

Cluster X

Location 2

Conf

Trans

Conf

Centralized call

processing cluster X

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 172