Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 195)

9-9

Cisco IP Telephony Network Design Guide

78-11103-03

Chapter 9 Catalyst DSP Provisioning

Catalyst MTP Transcoding Services

Voice Compression, IP-to-IP Packet Transcoding, and Conferencing

Connecting sites across an IP WAN for conference calls presents a complex

scenario. In this scenario, the Catalyst modules must perform the conferencing

service as well as the IP-to-IP transcoding service to uncompress the WAN IP

voice connection. In Figure 9-3 a remote user joins a conference call at the central

location. This three-participant conference call uses seven DSP channels on the

Catalyst 4000 module and three DSP channels on the Catalyst 6000. The

following list gives the channel usage:

• Catalyst 4000

–

One DSP channel to convert the IP WAN G.729a voice call into G.711

–

Three conferencing DSP channels to convert the G.711 streams into

TDM for the summing DSP

–

Three channels from the summing DSP to mix the three callers together

• Catalyst 6000

–

Three conferencing DSP channels are used. On the Catalyst 6000, all

voice streams will be sent to single logical conferencing port where all

transcoding and summing takes place.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 195