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Configuring IP Fax
Configuring IP fax options
MAX 6000/3000 Network Configuration Guide 7-7
Following is an example of an IP fax configuration that enables the MAX unit to handle
incoming fax calls as shown in Figure 7-3:
Ethernet
Mod Config
IP Fax Options
IP Fax Enabled=Yes
Incoming Port=1234
DNIS #1=2222
Server #1=10.1.2.34
Server #2=10.1.2.56
With this configuration, an IP fax is processed as follows:
1 An end user sends a fax to 123-555-1111.
2 The sending fax machine receives a dial tone from the redialer (which is directly
connected to the fax machine) and dials 123-555-1111.
3 The redialer intercepts the call, stores the destination telephone number, and dials its
configured number for the MAX unit (456-555-2222).
4 The MAX unit receives the call and identifies it as a fax call by comparing the call’s DNIS
number to the DNIS #N values in the IP Fax Options profile.
5 If the DNIS numbers match (or if the unit is configured to treat all incoming calls as IP fax
calls), the MAX unit generates an answer tone at 400 Hz to initiate dual-tone
multifrequency (DTMF) communication with the redialer. Then the unit decodes the
incoming DTMF sequence from the redialer, which contains the account number of the
redialer and the destination telephone number 123-555-1111.
6 The MAX unit initiates a connection to the fax server, sending the caller’s account number
and destination telephone number in the first TCP packet.
7 If the fax server authenticates the call successfully with this information, the MAX unit
answers the incoming fax call. If authentication fails, the connection is cleared.
8 Following successful authentication, the MAX unit and fax server establish a TCP
session, and the MAX unit transfers control of an available modem to the fax server for
the incoming call. If no send or receive activity occurs for more than 2 minutes, the
session is terminated and resources are freed.
Note: For fax accounting, a fax session starts when a modem resource is allocated and stops
when a session is terminated.
Example of an IP fax configuration for outgoing faxes
Figure 7-4 shows a MAX unit forwarding a fax received by the fax server from the Internet.
The fax server logs in to the unit, entering the specified Login and Password parameters, and
initiates a modem dial-out session to forward the fax over the PSTN. When the fax
transmission is completed, the fax server terminates the TCP session and the MAX unit gains
control of its modem.