Mitel TA7100 Series, Configuration

FAX Detection Flow

15

FAX Detection Flow

Configuring Machine Detection

If you are not familiar with the meaning of the fields, click Show Help, located at the upper right 
corner of the Web page, to display field description when mousing over the field name.

NOTE:  

This procedure is only required if your fax machine is directly connected to a specific FXS 

port and if this port is not used for modem transmission.

            Steps

1. Go to Media > Misc.

2. Set the CNG Tone Detection selection list to Enable.

3. Set the CED Tone Detection selection list to Enable.

4. Set the V.21 Modulation Detection selection list to Enable.

5. Set the Behavior On CED Tone Detection selection list to Fax Mode.

6. Click Apply.

Result:

IF

AND

THEN

If T.38 is enabled

• A CNG tone is detected, or
• A V.21 preamble is detected, or
• T.38 packets are received on the 

IP side

Then the Mitel unit switches to T.38

• If a CED tone is detected (Answer 

Tone or ANS) and no other 
conditions indicates that a fax is 
present, or

• If a fax is detected but T.38 is 

deactivated

Then the Mitel unit switches to Clear 
mode.

If a CED 

a

 is detected before a CNG

a. Note that the CED tone can be detected on both the IP side (egress side) or on the analog side (ingress side).

The Mitel unit will first switch to Clear 
Channel and if T.38 is enabled, it will 
then switch to T.38.