Cisco WS-X4604-GWY - VoIP Gateway Especificações descarregar pdf (Página 173)

7-11

Cisco IP Telephony Network Design Guide

78-11103-03

Chapter 7 Multisite WAN with Centralized Call Processing

DSP Resource Provisioning for Transcoding and Conferencing

Figure 7-6 Call Flow for a Centrally Transcoded Call to Voice Mail

Conferencing poses another example of an application that uses G.711 only.

Consequently, if the party wanting to make a conference call can traverse the

WAN using only a low-bit-rate codec, the call must be transcoded to G.711 before

the conference is initiated. See Figure 7-7.

Figure 7-7 Call Flow for a Centrally Transcoded Call with Conferencing

In the scenario shown in Figure 7-7, the call from the branch traverses the WAN

using G.729a but must be transcoded to G.711 before being added to the

conference resource.

IP WAN

Compressed call leg

G.711 call leg

Router/gateway

Router/gateway

Trans

IP

IP

IP

IP

40816

IP WAN

Compressed call leg

G.711 call leg

Router/gateway

Router/gateway

IP

IP

40817

Conf

IP

IP

IP

Trans

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