We can easily receive faxes if we set an option in our IVR to reach the fax extension. We can also use a direct line or route a DID for receiving faxes.
Configure an Inbound Route and set its destination as the fax extension.
We could also set up an Auto Attendant option as follows: For example, a recording may prompt ... press 5 if you want to send a fax. Then, we set the option number
5for the fax extension, as shown in the next figure.
Tip
It is very important to make sure that the T.38 protocol is supported when implementing a fax solution over a SIP or IAX VoIP trunk. The T.38 protocol is in charge of translating the analog fax protocol to the IP fax protocol and vice versa. It is highly recommended that you disable the echo canceling feature in any telephony card, in order to avoid causing any errors in the fax receiving/sending process. It is also important to use VoIP codecs such as u-law or a-law, and avoid the use of G.729. We can also use ATA adapters...