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if pvdm is necessary?

i want to use 2811 to support voip.

i have already update the ios,then if i must install pvdm.or not it is just improve performance

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Re: if pvdm is necessary?

You will need PVDMs for voice cards connecting to PSTN such as PRI, FXO, etc. Depending on the codec complexity being used you will need certain amount of PVDMs. For 1 G711ulaw call you need 1 PVDM channel. As an example PVDM2-32 has 32 channels. PVDMs can also be used for Transcoding and Conferencing.

So if you plan on connecting to PSTN you will need PVDMs.

HTH,

Chris

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