Conference Bridge Resources

A conference bridge is a resource that joins multiple participants into a single call. Depending on the conference bridge you are using, each conference call is limited to a certain number of participants and specific codecs. There is a one-to-one correspondence between media streams that are connected to a conference and participants who are connected. The conference bridge mixes the streams together and creates a unique output stream for each connected party. The output stream for a given party is the composite of the streams from all connected parties minus its own input stream.

Cisco CallManager supports both hardware and software conference bridges. Hardware and software conference bridges can be active at the same time.

Hardware-enabled conferencing provides the ability to support voice conferences using hardware resources. Digital signal processors (DSPs) convert multiple voice over IP (VoIP) packets into streams that are mixed into a single conference call stream. The DSPs support both Meet-Me and ad hoc conferences. Hardware conference devices can provide a mixing of multiple codecs on the same conference call for G.711, G.729, G.723, Global System for Mobile Communication (GSM) Full Rate (FR), and GSM Enhanced Full Rate (EFR). Not all hardware resources support all of these codecs, but they all support at least G.711 and G.729, which are the two codecs supported by all modern Cisco IP Phones.

Software conferences use the resources of Cisco CallManager. A software conference bridge is capable of mixing G.711 audio streams and Cisco Wideband audio streams. Any combination of Wideband or G.711 a-law and mu-law streams can be connected to the same conference.

Conference bridges enable both ad hoc and Meet-Me voice conferencing:

Note

The Meet-Me conference functionality included with Cisco CallManager is very basic and does not provide scheduling and/or security capabilities. The Cisco Meeting Place or Meeting Place Express software can be used for this functionality.

 

Conference Bridge Hardware

Table 15-1 identifies the conference bridge types that exist in Cisco CallManager 4.1 Administration. For each conference bridge type, the table lists the supported product or application, the supported codecs, and the maximum number of participants.

Table 15-1. Conference Bridge Hardware

Cisco CallManager Resource Type

Conferences Resource

Codecs

Max. Participants per Conference

Cisco Conference Bridge

WS-SVC-CMM

G.711 mu-law, G.711 a-law, G.729 annex A and annex B, and G.723.1

8 per conference, 64 conferences per port adapter

Cisco Conference Bridge Hardware

WS-X6608-T1 WS-X6608-E1

G.711, G.723, G.729, GSM FR, GSM EFR

1 CFB32 users to 10 CFB3 users

For G.711 or G.729a: 256 streams total per module, 32 streams maximum per port

Cisco Conference Bridge Software

Cisco IP Voice Media Streaming App.

G.711, Cisco Wideband

64Ad Hoc

128Meet-Me

Cisco IOS Conference Bridge

NM-HDV

G.711, G.729

6

Cisco IOS Enhanced Conference Bridge

NM-HD

NM-HDV2

WS-SVC-CMM-ACT

G.711, G.729, GSM FR, GSM EFR

G.711, G.729, or G723

8

Cisco Video Conference Bridge (IP/VC-35xx)

IP/VC-35xx

Numerous audio and video coding schemes

Varies by platform

Brief descriptions of the conference resources follow:

Table 15-2 provides additional detail about audio conference bridges.

Table 15-2. Conference Bridge Hardware

Conference Type in Cisco CallManager

Number of Participants and Bridges

Resource

Hardware

For G.711 or G.729a:

  • 256 streams total per module and 32 streams maximum per port.
  • Bridges can range from 10 bridges with 3 participants to 1 bridge with 32 participants.

For all GSM:

  • 192 streams per module and 24 streams per port

WS-X6608-T1

WS-X6608-E1

CallManager Software (Cisco IP Voice Media Streaming Application)

IP Voice Media Streaming Application on a standalone server:

  • 128 streams.
  • Ad hoc conference bridges can range from 42 bridges with 3 participants to 2 bridges with 64 participants.
  • A Meet-Me conference is 1 bridge with up to 128 participants.

IP Voice Media Streaming Application coresident with Cisco CallManager:

  • 48 streams.
  • Bridges can range from 16 bridges with 3 participants to 1 bridge with 48 participants.

Software

Cisco IOS software

  • 3 bridges per PVDM-12
  • 3, 6, 9, or 15 bridges per NM
  • Maximum of 6 participants per bridge

For information on the PVDM2-8, PVDM2-16, PVDM2-32, PVDM2-48, and PVDM2-64, refer to the "Hardware Resources for MTP, Conferencing, and Transcoding" section of the Cisco IP Telephony Solution Reference Network Design (SRND) for Release 4.1 at: http://www.cisco.com/go/srnd

NM-HDV

Enhanced Cisco IOS software

The total number of conference sessions is limited by the capacity of the entire system, the Cisco CallManager, and the codec. Further details can be found in the "Cisco Enhanced Conferencing and Transcoding for Voice Gateway Routers" data sheet at: http://www.cisco.com/en/US/products/ps5855/products_data_sheet0900aecd801b97a6.html

NM-HD

NM-HDV2

Note

The hardware and capacities described in Table 15-2 are accurate at the time of this writing; however, Cisco is continually adding new hardware and making improvements on existing hardware. To ensure accuracy when provisioning your network, refer to the latest CallManager SRND documentation available at http://www.cisco.com/go/srnd.

 

Conference Bridge Hardware CallManager Configuration

You must add hardware-based conference bridges to the Cisco CallManager configuration for the cluster to utilize them. The process of adding conference bridge resources differs, based on the type of conference resources you are adding. As an example, the following steps demonstrate the addition of a WS-X6608 as a DSP farm resource to the Cisco CallManager configuration:

Step 1.

Choose Service > Media Resource > Conference Bridge and then choose Add a New Conference Bridge.

 

Step 2.

Choose Cisco Conference Bridge Hardware in the Conference Bridge Type field. The Conference Bridge Configuration window shown in Figure 15-1 appears.

 

Figure 15-1. Cisco Conference Bridge Hardware Configuration

 

Step 3.

Add the MAC address of the WS-X6608 port that will be used for conferencing.

 

On the WS-X6608, the port must be pointed toward the Cisco TFTP server to obtain the configuration file and a list of the Cisco CallManager servers within the Cisco IP telephony network to use for registration. Use the set port voice interface command on Cisco Catalyst switches running the Catalyst operating system to point the port toward the Cisco TFTP server (usually the publisher server).

The following example disables Dynamic Host Configuration Protocol (DHCP) on port 3/1 of a 6608 port, assigns an IP address, subnet mask, VLAN number, and default gateway, and points the port to the Cisco TFTP server (in bold):

set port voice interface 3/1 dhcp disable 172.16.10.201 255.255.255.0 vlan 15 tftp 172.16.10.5 gateway 172.16.10.1

Note

Any Cisco CallManager servers in the cluster that have the Voice Media Streaming Application service activated will automatically be listed and used as a software-based conference resource. If you do not want a CallManager server to participate in conference bridge processing (to save resources), you can remove it as a conference bridge server by deleting the CallManager server in the Conference Bridge Configuration window.

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