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greenwichmeantime
2007 Mar 24
2
TDM analog cards, volume, echo, fxotune, ztmonitor and HPEC
Hi, everyone:
I am developing a system using Asterisk, TDM-400 analog cards, analog
lines, and Polycom SIP phones for internal extensions.
Initially there was bad echo but after a series of efforts, I've managed
to reduce it to a negligible level (it only happens when both parties
speak simultaneously, and even there, only for a few hundred
milliseconds). From an echo standpoint, things are