VoIP echo on POTS lines
Date Posted: June 01, 2008 03:54 PM
Author: Mel Beckman
Dear Doctor, Our VoIP system has two kinds of trunk connections to the local exchange carrier (LEC): an ISDN PRI T1 circuit with six channels for long distance and another four plain old telephone service (POTS) analog voice lines used for local calls. We're charged by the minute for both local and long distance on the ISDN PRI, while there are no per-minute charges on the POTS lines for local calls. The problem is that calls through the POTS lines suddenly have a terrible echo on them. The phone company tested and says that it's our gear; the VoIP vendor blames the phone company. Whose fault is it, really? And how do we fix it?

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