DSPs and connections to PSTN

[cboland]

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.

[Chester Rieman]

Digital PSTN connections are g711u.

[cboland]

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

[Chester Rieman]

DSPs are still used.

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

[Chester Rieman · Accepted solution]

DSPs are still used.

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