QUESTION Sangoma A102 echo on some calls

[Jason Mayerle]

We have been running with a Sangoma A102 and a Comcast PRI for about two years and have had no issues. Recently connected an AccessOne PRI to our A102 and now we are getting local echo on some (but not all) calls. It's almost like too much sidetone - but only some calls. Internal system calls as expected are flawless, as are the bulk of external calls in/out. Only a small handful are problematic. Right now I can reliably reproduce the problem when calling to/from an AT&T landline at home.

Spent a little time playing with rx/txgain - that helps but leads to complaints that the rest of the calls are soft volume, and users cannot turn up volume enough.

Installed OSLEC, but that seems to have zero impact on this echo - no difference between that and MG2.

I've reviewed the docs and under dahdi there do not seem to be any/many options for tuning OSLEC - is there anything I should be looking at before convincing the powers that be that we need a card with hardware echo cancellation -or- port all our DIDs to the Comcast PRI?

Thanks in advance for any insight!

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PIAF Installed Version = 2.0.6.2 under *HARDWARE*
FreePBX Version = 2.11.0.27
Running Asterisk Version = 1.8.13.0
Dahdi Source Version = 2.6.1+2.6.1

 

[atsak]

Get hardware EC. Why waste hours on a $200 solution.