7-4
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for H.323 (version 3.0)
OL-4804-01
Chapter 7 Configuring and Debugging Fax Services
Using Fax Pass-through Mode
Note
For detailed information on setting up your IOS gateways and on feature availability, refer to the
document
Cisco Fax Services over IP
.
Enable Fax Pass-through Mode
The supporting Cisco gateway can enable
fax pass-through mode
using system-level or dial-peer-level
commands.
System Level commands
Enable the fax pass-through feature using the following system-level commands:
Procedure
Step 1
Run the following command:
voice service voip
Step 2
Run the following command:
modem passthrough NSE [payload-type
number
] codec {g711
µ
/law | g711alaw} [redundancy]
[maximum-sessions
value
]
The definitions of the command parameters are as follows:
•
The
payload-type
parameter default is 100. Valid values are from 98 to 119.
The NSE payload number must be the same on both the Cisco ATA and the Cisco gateway.
•
The
codec
parameter must be G.71
1µ−
law for faxes sent over a T1 trunk or G.711A-law for faxes
sent over an E1 trunk.
•
The
redundancy
parameter enables RFC 2198 packet redundancy. It is disabled by default.
•
The
maximum sessions
parameter defines the number of simultaneous fax pass-through calls with
redundancy. The default is 16. Valid values are 1 to 26.
Step 3
For the Cisco ATA ConnectMode parameter, turn off bits 14 and 15. This enables the sending of fax
pass-through signals and the detection of incoming fax pass-through signals using the Cisco proprietary
method.
Note
The NSE payload-type number, fax pass-through codec (G.71
1µ
-law or G.711A-law) and redundancy
parameters must have the same settings for the Cisco ATA that they have for supporting Cisco gateways.
