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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
OL-4803-01
Chapter 6 Configuring and Debugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
Using prserv for Diagnosing Fax Problems
This section contains the following topics:
• prserv Overview, page 6-9
• Analyzing prserv Output for Fax Sessions, page 6-9
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outdated model.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
Fax/modem pass-through
method on the remote
gateway is not compatible
with the Cisco NSE-based
method.
Some Cisco gateways (such as Cisco VG248, and Cisco 6608) may use
signaling messages based on RFC2833 for G.711 upspeed when loaded
with older software images. This method is incompatible with the Cisco
NSE-based method.
You must check to make sure that the image on your gateway supports the
Cisco NSE-based fax/modem pass-through. Otherwise, you must
configure the Cisco ATA to use fax mode.
NSE payload types differ
between gateways.
The Cisco ATA has a configurable NSE packet payload-type value whose
default is 100. This value is compatible with the implementations of most
Cisco gateways. However, some Cisco gateways use 101 as the NSE
payload type.
Ensure that all gateways in your environment use the same NSE payload
type if you wish to successfully use fax pass-through mode.
Table 6-1 Solving Common Fax Problems (continued)
Problem Action