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Data Sheet

Cisco Enhanced Conferencing and Transcoding for Voice Gateway Routers
Cisco Enhanced Conferencing and Transcoding for Voice Gateway Routers provides conferencing and transcoding capabilities in Cisco IOS Software-based gateways using the onboard Cisco Packet Voice/Fax Digital Signal Processor Modules (PVDM2 / PVDM3) on the Cisco 2800, 3800, 2900 and 3900 series voice gatewayrouters. This capability is also supported on Cisco voice gateway router platforms using the Cisco IP Communications Voice/Fax Network Module and the Cisco IP Communications HighDensity Digital Voice/Fax Network Module. This feature is delivered in Cisco IOS Software and operates in conjunction with Cisco Unified Communications Manager (CUCM) or Cisco Unified Communications Manager Express (CUCME) orCisco Unified Border Element (CUBE).
The Cisco Enhanced Conferencing and Transcoding for Voice Gateway Routers feature provides enhanced multiservice support for Cisco routers in a Cisco Unified Communication Network. This is accomplished by enabling audioconferencing and transcoding functions in access routers. This single-package solution simplifies deployment, eases administration, and helpsdeliver tangible cost savings by locating conference resources in the branch to reduce WAN utilization. This feature further minimizes costs by using transcoding services to reduce bandwidth needs. An integral part of Cisco Unified Communications solutions, Cisco Systems IP telephony offers feature-rich telephony services on a fully converged IP network. Using Cisco 2800,3800, 2900 and 3900 seriesonboard digital signal processor (DSP) capability and also available on the Cisco IP Communications Voice/Fax Network Module (NM-HD) and the Cisco IP Communications High-Density Digital Voice/Fax Network Module (NM-HDV2), the Cisco Enhanced Conferencing and Transcoding for Voice Gateway Routers feature preserves all the WAN, public switched telephone network (PSTN), and private branch exchange (PBX)access capabilities while adding rich-media conferencing and transcoding functions.
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Audio Conferencing Services
In a traditional circuit-switched voice network, all voice traffic goes through a central device (such as a PBX system), which provides audioconferencing services as well. Because IP phones transmit voice traffic directly between phones, a network-based conferencebridge is required to facilitate multiparty conferences. In an IP telephony network using CUCM or CUCME, the Cisco Enhanced Conferencing and Transcoding for Voice Gateway Routers feature provides the conference bridging service. This feature also supports these services:
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Cisco CUCM and CUCME Meet-Me and ad-hoc conferences with up to 64 participants Substantial scalability in the number ofconferences supported based on the number of Cisco Packet Voice DSP Fax/Voice Modules (PVDM2s or PVDM3s) employed

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G.711 a/u-law, G.729, G.729a, G.729b, G.729ab, G.722, iLBC participants joined in a single conference Easy deployment of conference resources in routers across the network; this provides a local conference resource, reduces WAN utilization, and improves voice network performance© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.

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Data Sheet

Figure 1.

Conferencing

Universal Transcoding Services
Transcoding enables two important functions in an IP telephony network. The first is to save on WAN utilization and attendant costs. This is accomplished by compressing voice traffic across the WAN. The second isto enable communication between different devices that support different codecs. PVDM2 and PVDM3 support universal transcoding from one of the supported codecs to another.
Figure 2. Transcoding

Platform Support and Software Requirements
Cisco Enhanced Conferencing and Transcoding for Voice Gateway Routers provides the following platform support and requires the following software:
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