4.13. Sending and Receiving Faxes over IP

The functionality described in this section are the mechanisms that support the sending are receiving of fax information over IP (FoIP). Separate fax resources are required to handle fax transmission and reception.

Note: Sending and receiving faxes using SIP is not currently supported.

A fax over IP (FoIP) call can be initiated in the following ways:

• At call setup time, the local side requests FoIP (T.38 only) for either an outgoing or incoming call.
• At call setup time, the remote side requests FoIP (T.38 only) for either an outgoing or incoming call.
• A voice call is connected and fax tones are detected on the local endpoint; the call switches to FoIP transcoding.
• A voice call is connected and the remote endpoint requests a switch to FoIP transcoding; the call switches to FoIP transcoding.

In any one of these scenarios, the local application must specify T.38 coder capability in advance if FoIP exchange is to be allowed.

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