I use EVM-HD 8FXS/DID on ISR 3825 and analog fax (connected to fxs port on EVM-HD 8FXS/DID).
From fax I can make a call to PSTN and have connection without problems with another customer of PSTN. But if I call to fax, I hear a fax from the other side just during 1...2 seconds and then I get a silence and can't send a fax (my fax machine tells that it "has no connection or response").
If this is a pots to pots fax (FXS on the inside, PRI or FXO on the PSTN side), I have seen instances where the volume out to the PSTN was too low, or volume inbound was too high. This can cause one side to not recognize the other as a fax transmission and drop the call. Try playing with the input gain/output attenuation on one of the pots legs.
Have you tried faxing inbound? Does that work?
Otherwise, we need to see the config, and need to know that complete call flow. Is the fxs port mgcp controlled? Are you doing H323/SIP to CUCM and hairpinning back to the gateway and out the PSTN?
For fax on EVM-HD 8FXS/DID I created one dial peer (which is in config) and checked that it matches numbers which I dial for testing. We don't use mgcp and we don't use H323/SIP to PBX in this situation.
I also tried to change gain on the call legs:
or EVM-HD 8FXS port: (config)#voice-port 2/0/0 (config-voiceport)#input gain 7 (config-voiceport)#output attenuation 10
for outbound call leg: (config)#voice-port 0/2/0:15 (config-voiceport)#input gain 7 (config-voiceport)#output attenuation 10
after that I hear fax during 1...2 seconds and than periodical peeps,
when I set gain to 9 for both call legs I have a problem with digit identification by ccme
do recommended values of gain and attenuation exist?
inside a network faxes were trinsmited successfuly
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