Communication Manager uses the Relay mode or the Pass-through mode to transport fax, modem, and Teletypewriter device (TTY) calls over IP interfaces. Communication Manager supports transport of the following:
TTY calls over the corporate Intranet and the Internet
Faxes over a corporate Intranet or the Internet
Note:
Faxes sent to non-Avaya endpoints cannot be encrypted.
T.38 fax over the Internet, including endpoints connected to non-Avaya systems
Modem tones over the Internet, including endpoints connected to non-Avaya systems
