[Asterisk-Users] Any echo issues with phones from TDM400P > X100P

[Jason A. Pattie]

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Rich Adamson wrote:
|>Hi,
|>I'm thinking of purchasing a TDM400P card and was wondering if anyone has
|>experienced any echo issues with phones off these cards connecting to the
|>PSTN via the X100P cards?
|>
|>I have had my fingers burnt with a Voip phone > X100P.
|
|
| I replaced two x100p's with a tdm04b 4-port fxo card, and the echo problem
| with pstn lines are absolutely no different; echo is still there and I've
| spent a substantial amount of time attempting to improve it (as an ex-
| telco engineer). Three pstn lines from two central offices all identical.
| Attaching these same three pstn lines to a Mediatrix 1204 totally
| eliminated all echo, however the 1204 had other problems that caused
| me to return it to the reseller. Tried ever combination of echo
cancellation
| options in Make and *.h files that folks have suggested, problem is
| still there and most disturbing during the first 15 seconds of all calls.
|
| As a non-programmer and * user for over nine months, its my opinion
(right,
| or wrong) that past echo problems have had two sources; one from pstn
| mismatch problems that have been heavily discussed since about September
| 2003. The other source has not yet been found/diagnosed and "seems" to
| be system dependent (and its not irq related either). You either have
| it or you don't, and the few developers that have either the x100p or
| the tdm card installed, don't seem to have the problem. Therefore
diagnosing
| the root cause is still waiting on someone with the problem _and_ the
| programming skills.

I absolutely second this notion.

- --
Jason A. Pattie
pattieja at xperienceinc.com
Xperience, Inc. (http://www.xperienceinc.com)
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