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DSPs and connections to PSTN

cboland
Level 1
Level 1

I was wondering if any/what kind of codecs are used connecting to the PSTN using a T1 MFT interface from a IP phone. I want to use an AIM-VOICE-30 with a 2600 router and I want to make sure I will have enough DSPs. The phones are all using G.711 compression.

1 Accepted Solution

Accepted Solutions

DSPs are still used.

Yes, echo cancellation will still happen on the DSPs as well as any transcoding beween ulaw and alaw(if needed)

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4 Replies 4

Chester Rieman
Cisco Employee
Cisco Employee

Digital PSTN connections are g711u.

So then there are no DSPs used? How about for echo cancelation?

DSPs are still used.

Yes, echo cancellation will still happen on the DSPs as well as any transcoding beween ulaw and alaw(if needed)

DSPs are still used.

Yes, echo cancellation will still happen on the DSPs as well as any transcoding beween ulaw and alaw(if needed)

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