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

Cisco recommends IOS version 12.2 (11)T or higher for the Cisco 2600

loaded with correct

and Cisco 3600, and IOS version 12.1 (3)T or higher for Cisco AS5300.

software image.

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 ATA is not

Cisco recommends using software version 2.14 or higher.

loaded with the proper

 

software.

 

 

 

User is operating

Cisco recommends using Cisco ATA models 186-I1, 186-I2, 188-I1, or

Cisco ATA software on an

188-I2 (hardware platforms).

outdated model.

 

 

 

The Cisco ATA is not

For fax mode, the AudioMode configuration parameter should be set to

configured for fax mode or

0xXXXX0012 (X = value not applicable) for the Phone 1 port of the

fax pass-through mode.

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

When the Cisco ATA is configured for fax pass-through mode, all remote

configured for modem/fax

gateways must be configured with modem/fax pass-through mode either

pass-through mode.

on a dial-peer level or system level.

 

 

Fax relay is not disabled

Fax relay is enabled by default on some Cisco gateways. When fax relay

on the remote gateway.

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

Some Cisco gateways (such as Cisco VG248, and Cisco 6608) may use

method on the remote

signaling messages based on RFC2833 for G.711 upspeed when loaded

gateway is not compatible

with older software images. This method is incompatible with the Cisco

with the Cisco NSE-based

NSE-based method.

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

The Cisco ATA has a configurable NSE packet payload-type value whose

between gateways.

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.

 

 

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)

7-8

OL-3410-01

 

 

Page 140
Image 140
Cisco Systems ATA186I2ARF manual Problem Action, Cisco ATA, and 0x0012XXXX for the Phone 2 port, Port