Chris Mason wrote:
I have a client's installation that requires 4 lines PSTN interface only so I am looking at 4 port FXO units. What works well with Asterisk and is not exorbitant to purchase? Would a Sangoma remora be better?
The Sangoma A200D card has better echo canceller (if needed) compared to the Digium TDM card, plus the A200D card "does" support modem calls (eg, faxing, POS) when the modem is plugged into a fxs port on the same card as the fxo ports.
For external adapters, the only one that I've tested that functioned reliably was the Mediatrix 1204 at a rather heafty price. It did an excellent job with echo cancellation, audio levels, and audio quality; but, their implementation (about two years ago) was very non standard with absolutely no security, etc. That may have changed now, but at the time, it could only be configured using snmp and with an snmp community string of "public" (which could not be changed). Rather difficult to set up, but once configured it just worked.
I've tested a large number of other external adapters and have not found a single one that had a reasonable echo canceller built in. Many of them work fine on short pstn lines (where echo is much less of a problem), but provided even reasonable service on longer pstn lines or lines that involve unusual telco configurations (eg, remote line concentrators).
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