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New Member

DSPs and connections to PSTN

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
Cisco Employee

Re: DSPs and connections to PSTN

DSPs are still used.

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

4 REPLIES
Cisco Employee

Re: DSPs and connections to PSTN

Digital PSTN connections are g711u.

New Member

Re: DSPs and connections to PSTN

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

Cisco Employee

Re: DSPs and connections to PSTN

DSPs are still used.

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

Cisco Employee

Re: DSPs and connections to PSTN

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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