Coherent "CallPort"

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I have inherited a Coherent CallPort echo-cancelling speaker/microphone.
Unfortunately that's all - no cable, interface or instructions.
I understand it was bought for use with a video-conferencing system that was
little used about 10 years ago. Now I'm looking for something like this to
try VOIPing.
Does anyone have any information about these, that might help me see if I
can get it back into service?
Don Brown.

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