I am experiencing some issues when working with T.38 Fax in my network. I am simply unable to send / receive any faxes. The topology is quite simple:
Branch VoIP Router --> Central VoIP Router --> E1s to Alcatel PBX --> PSTN
The Branch voip router is able to send and receive phone calls normally, passing through the central VoIP router, which has E1 interfaces in order to send those phone calls to the Alcatel PBX that offers the connectivity to the PSTN services.
When a fax machine connected to the Branch VoIP router sends faxes to a remote fax machine, the remote fax machine rings and answers the call, but the fax transmission is then aborted. I've tried different remote fax machines and none worked, either when sending or receiving faxes.
With reference to Phone calls, everything works perfectly. My only issue here is when trying to send/receive faxes. I am enclosing my configuration below:
Is T.38 configured on both the branch and central router? Since you have configured it on a specific dial-peer instead of globally (voice service voip) have you confirmed that those voip dial-peers are being matched on both routers for the call? When the DSP of one router detects the fact tones it initiates a T.38 switchover; both routers must be configured for this to work.
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