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Echo Problem in FXO Card

Hi,

I have 2 Router in Office A and Office B, Office A has FXS card and Office B has FXO Card.

In Office B, FXO card has 2 Lines terminated from PBX . In Office A which have FXS card 2 Analog Phones are connected.

When i call from Office B to Office A, Caller from Office B hear ECHO whereas Office A Receiver listen properly.

Can any 1 help me why Caller in Office B gets Echo. There is Analog Phone in Office B. Caller Listen what they speak again.

Can any 1 help me to tune the FXO Card Setting.

Thanks in Advance.

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