Cisco VGD-1T3, Руководство по настройке программного обеспечения

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Using Cisco Unified Communications Manager to Configure Transcoding and Media Termination Point
Information About Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway
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Cisco VGD 1T3 Voice Gateway Software Configuration Guide
Figure 1 Transcoding Service
Media Termination Point
A Media Termination Point (MTP) bridges the media streams between two connections allowing
Cisco Unified Communications Manager to relay calls that are routed through SIP or H.323 endpoints.
The following MTP resources are supported for Cisco Unified Communications Manager 4.0 (formerly
known as Cisco CallManager 4.0) and later releases:
•
Software MTP—Software-only implementation that does not use a DSP resource for endpoints
using the same codec and the same packetization time.
• Hardware MTP—Hardware-only implementation that uses a DSP resource for endpoints using the
same G.711 codec but a different packetization time. The repacketization requires a DSP resource
so it cannot be done by software only. Cisco Unified Communications Manager also uses the term
software MTP when referring to a hardware MTP.
For MTP and transcoding, the DSP farm supports only two IP streams connected to each other at a time.
If more than two streams need connecting, the streams must be connected using conferencing.
Allocation of DSP Resources
You must allocate DSP resources on two levels:
•
Within the voice network module, between the DSP farm and your voice trunk group that handles
standard voice termination
• Within the DSP farm, between transcoding and voice-conferencing services
Allocation of DSP Resources Within the Voice Network Module
You allocate DSP resources either to voice termination of the voice trunk group or to the DSP farm.
Occasionally these allocations can conflict.
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