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G729 WAN Calls without transcoder ?

mderriennic
Level 1
Level 1

Hi,

My customer has a WAN MPLS and 2 remote sites. On each site he has a legacy PBX. He wants to use his MPLS WAN to carry voice using G729B by connecting each PBX to a local GW using an E1 PRI (Euro ISND) link. He has to use G729B because of the future use of Cosmocom Call Center (MCC).

Each GW will use a VWIV-1MFT-E1 (E1 PRI link to legacy PBX) as well as 1 PVDM2-32 module.

I wonder wether I have to add or not additionnal DSP to transcode voice between G711 and G729B (according to the DSP calculator I need then 7 DSP). If so, I guess I also have to add CCME on each GW.

Or is the 2811 GW able to set up G729B calls directly from an E1 PRI (wich use G711 codec) to a remote WAN GW ?

Thanks for your help

Marc

1 Accepted Solution

Accepted Solutions

dgahm
Level 8
Level 8

The gateway can do G729, so you do not need transcoding DSPs, but you do need more DSPs to terminate G729 calls than G711. With your one PVDM2-32 you can handle 16 G729A calls. If you need to be able to handle the full 30 E1 channels you will have to add another PVDM2-32. If you really want to do G729B you will need to add a PVDM2-64.

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1 Reply 1

dgahm
Level 8
Level 8

The gateway can do G729, so you do not need transcoding DSPs, but you do need more DSPs to terminate G729 calls than G711. With your one PVDM2-32 you can handle 16 G729A calls. If you need to be able to handle the full 30 E1 channels you will have to add another PVDM2-32. If you really want to do G729B you will need to add a PVDM2-64.

Please rate helpful posts.