Avaya Communication Manager Administrator's Manual page 1135

Note:
If you have a telephone that is on an IP trunk too close to a fax machine, the
Note:
handset can pick up the tones from the fax machine and change itself into the fax
mode. To prevent this, set the FAX field to off, and put the FAX machines in an
ARS partition that uses only circuit switched trunks, even for IGW FAX calls.
Maximum Bandwidth Per Call for Direct-IP Multimedia (value)
This field appears only when Allow Direct-IP Multimedia is y.
Valid entries
1 to 9999
Maximum Bandwidth Per Call for Direct-IP Multimedia (units)
This field displays only when Allow Direct-IP Multimedia is y.
Valid entries
kbits
mbits
Modem Mode
Valid entries
off
Usage
Enter the bandwidth limit for Direct-IP Multimedia transmissions on this
codec set. Default is 256.
Usage
Enter the unit of measure corresponding to the value entered for
bandwidth limitation. Default is kbits.
Usage
Turn off special modem handling when using this codec set. In this case,
the modem transmission is treated like an ordinary voice call. This is the
default for new installations and upgrades to Communication Manager
R2.1.
With a codec set that uses G.711, this setting is required to send modem
calls to non-Avaya systems.
IP Codec Set
Issue 2.1 May 2006 1135