There are a lot of litterature / Documentation concerning Fax in a Cisco VoIP Environment.
Problem is we can easely get lost regarding all the possible configuration, ie Fax Relay, T38 Fax Relay, Modem Passthrough, Fax Passthrough, combination with H323, MGCP or SIP and finally I could not get a simple example that would make my Fax work :)
Running CUCME 6.1, GW 3825, HWIC-8-FXS-DID card, E1, MGCP. The GW works fine and the FXS analog port also, when using a analog phone. However fax transmission causes some problems. Failure after communication is established. I aim at using Modem passthrough.
current mgcp config:
mgcp call-agent 10.126.0.225 2427 service-type mgcp version 0.1
If you want to use modem passthrough for your fax calls then you should disable Cisco fax relay as well using "no ccm-manager fax protocol cisco" because it is on by default and will take precedence over modem passthrough.
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