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Chapter 7
Configuring and Debugging Fax Services
Table 7-1
Problem
Fax/modem pass-through
method on the remote
gateway is not compatible
with the Cisco NSE-based
method.
NSE payload types differ
between gateways.
Using prserv for Diagnosing Fax Problems
This section contains the following topics:
•
•
prserv Overview
prserv is a tool that runs on a Microsoft Windows-based PC and serves as a log server that captures
debug information that the Cisco ATA sends to your PC IP address/port. The debug information is saved
into a readable text file.
To enable your Cisco ATA to send debug information, you need to set the NPrintf configuration
parameter to your PC IP address and an available port, as shown in the following procedure:
Procedure
Step 1
<IP address>.<port>
<IP address> is the IP address of your PC.
<port> is any unused port (any number from 1024 to 65535) on your PC.
Note
Step 2
To operate the debug capture program prserv.exe, place the prserv program in a folder on your PC. At
the DOS prompt, enter:
C:>prserv <port>
<port> is the port number you have selected. If <port> is omitted, the default port number is 9001.
OL-4804-01
Solving Common Fax Problems (continued)
Action
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.
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.
prserv Overview, page 7-9
Analyzing prserv Output for Fax Sessions, page 7-10
You can the Nprintf parameter on the Cisco ATA configuration web page or with the
TFTP-based configuration method.
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0)
Debugging the Cisco ATA 186/188 Fax Services
7-9
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