Specifications

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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for SCCP (version 3.0)
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Chapter 6 Configuring and Debugging Fax Services
Using Fax Pass-through Mode
Configuring Cisco IOS Gateways to Enable Fax Pass-through
To configure your IOS gateways to network with Cisco ATA, do the following:
Procedure
Step 1 Enable Fax Pass-through Mode, page 6-4
Step 2 Disable Fax Relay Feature, page 6-6
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 {g711μ/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.711μ−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.