jbarcena Tue, 11/04/2008 - 16:19
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DSPs provide four major functions in a voice gateway:

- Voice termination: is the process of digitizing and packetizing the audio stream on a TDM interface. A DSP is required to convert the traditional audio stream to VoIP.


- Trancoding: is the process of matching two disparate VoIP streams. This is required when the codecs or sampling rate of two VoIP streams do not match.


- Conferencing: The DSPs in a voice gateway cna be registered to a CallManager to provide hardware based conferencing.


- Media termination point (MTP): You insert MTP's into a call to provide supplementary services if H323v2 is not supported end to end. Supplementary services include hold, converence, or other signaling instructions that are invoked during the call.



http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_configuration_example09186a0080334294.shtml


Here is the DSP calculator:

http://www.cisco.com/cgi-bin/Support/DSP/dsp-calc.pl



Cisco voice gatewasy use various DSP models with different capabilities. Some GW and Network Moduls (NM) use modular DSPs, or Packet Voice DSP Modules (PVDM).

webstd.design Tue, 11/04/2008 - 23:32
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Hello. Can you share student guide for CIPT2? I have only CIPT1 Student Guide

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