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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
Debugging the Cisco ATA 186/188 Fax Services
Table 7-1
Solving Common Fax Problems
Problem
Action
The far-end gateway is not
loaded with correct
software image.
Cisco recommends IOS version 12.2 (11)T or higher for the Cisco 2600
and Cisco 3600, and IOS version 12.1 (3)T or higher for Cisco AS5300.
The Cisco 6608 supports both the NSE and NTE methods of
fax
pass-through mode
, beginning with software version
D004030145S16608. To use
fax pass-through mode
with the Cisco 6608,
the user must select 6608 NSE mode, and the NSE payload type must be
reconfigured to match the Cisco ATA.
The Cisco IOS gateway is
not configured using the
external T1 clock.
Perform these steps:
1.
Enter the following CLI commands:
Controller T1 0
clock source line
2.
On the Cisco CallManager Gateway Configuration page, choose the
T1 line connection port. Set the clock as “external primary.”
The Cisco ATA is not
loaded with the proper
software.
Cisco recommends using software version 2.14 or higher.
User is operating
Cisco ATA software on an
outdated model.
Cisco recommends using Cisco ATA models 186-I1, 186-I2, 188-I1, or
188-I2 (hardware platforms).
The Cisco ATA is not
configured for
fax mode
or
fax pass-through mode
.
For
fax mode
, the AudioMode configuration parameter should be set to
0xXXXX0012 (X = value not applicable) for the
Phone 1
port of the
Cisco ATA, and 0x0012XXXX for the
Phone 2
port.
For
fax pass-through mode
, AudioMode should be set to 0xXXXX0015
for the
Phone 1
port of the Cisco ATA, and 0x0015XXXX for the
Phone
2
port.
The remote gateway is not
configured for modem/
fax
pass-through mode
.
When the Cisco ATA is configured for
fax pass-through mode
, all remote
gateways must be configured with modem/
fax pass-through mode
either
on a dial-peer level or system level.
Fax relay is not disabled
on the remote gateway.
Fax relay is enabled by default on some Cisco gateways. When fax relay
is enabled, it can override
fax pass-through mode
and cause fax failure.
Examples of the CLI commands to disable fax relay for IOS gateways are
as follows:
•
fax rate disable
for H.323/SIP gateways
•
mgcp fax t38 inhibit
for MGCP gateways
