Windows fax and scan - Incoming fax reception error


We use server 2008 R2 as windows fax server.
We use two different line to send and receive faxes. We use multitech business modem to receive as incoming to receive faxes.
It does receive faxes. However, most of the faxes does not received due to error.
It says , incoming fax could not be received due to transmission error, only part of the message were received.

Does anyone have solution to fix this incoming fax issue permanently?

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