Cisco Systems ATA 186 Enable Fax Pass-through Mode, System Level commands, voice service voip

Chapter 6 Configuring and Debugging Fax Services

Using Fax Pass-through Mode

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-typeparameter 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.

Step 3 Turn off bits 14 and 15 of the Cisco ATA ConnectMode parameter. This enables the sending of fax pass-through signals and the detection of incoming fax pass-through signals using the Cisco proprietary method.

Note The NSE payload-type number, fax pass-through codec (G.711µ-law or G.711A-law) and redundancy parameters must have the same settings for the Cisco ATA that they have for supporting Cisco gateways.

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)

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