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Cisco IP Telephony Network Design Guide

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Chapter 9 Catalyst DSP Provisioning

Catalyst Conferencing Services

with a maximum of 32 simultaneous G.711 or G.723 conference callers per

configured logical port. This results in a maximum of 256 conference participants

per module with G.711 or G.723 calls.

See Table 9-1 for a summary of conference call densities for each module.

Both the WS-X4604-GWY and WS-X6608-T1 (or WS-X6608-E1) modules use

Skinny Station Protocol to communicate with Cisco CallManager when providing

conferencing or transcoding services. The Catalyst 6000 voice conferencing

solution can support both compressed and uncompressed conference attendees.

On the Catalyst 4000, only G.711, or uncompressed, calls can be joined to a

conference call. When the conferencing service registers with

Cisco CallManager, using Skinny Station Protocol, it announces that only G.711

voice calls can be connected. If any compressed calls request to be joined to a

conference call, Cisco CallManager connects them to a transcoding port first, to

convert the compressed voice call to G.711. Once the G.711 connections are

associated with a particular conferencing session (maximum of six participants

per conference call), the call is converted to a TDM stream and passed to the

summing logic, which combines the streams. Unlike the WS-X6608-x1, which

can mix all conference call participants, the Catalyst 4000 WS-X4604-GWY

module sums only the three dominant speakers. The WS-X4604-GWY

dynamically adjusts for the dominant speakers and determines dominance

primarily by voice volume, not including any background noise.

You should also observe the following recommendations when configuring

conferencing services:

• When provisioning an enterprise with conference ports, first determine how

many callers will attempt to join the conference calls from a compressed

Cisco CallManager region. Once you know the number of compressed

callers, you can accurately provision the MTP transcoding resources.

• Conference bridges cannot register with more than one Cisco CallManager at

a time, and Cisco CallManagers cannot share DSP resources. Therefore, you

must configure separate conferencing modules for each Cisco CallManager

in the cluster.

Figure 9-1 illustrates the components used in Catalyst conferencing services.

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