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6-2
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
Using Fax Pass-through Mode
Note The Cisco ATA can also accept standard-based protocol-level codec switch requests, but cannot send
such requests. Therefore, to interoperate with a Cisco gateway, use the Cisco-proprietary codec switch.
This section contains the following topics:
• Configuring the Cisco ATA for Fax Pass-through mode, page 6-2
• Configuring Cisco IOS Gateways to Enable Fax Pass-through, page 6-3
Configuring the Cisco ATA for Fax Pass-through mode
Fax Pass-through mode requires configuring two parameters:
AudioMode, page 6-2
ConnectMode, page 6-3
AudioMode
Description
The AudioMode parameter is a 32-bit value. The lower 16 bits apply to the Phone 1 port of the
Cisco ATA and the upper 16 bits apply to the Phone 2 port of the Cisco ATA.
Example
The following is an example of how to configure the Phone 1 port of the Cisco ATA for fax
pass-through mode:
0xXXXX0015
Translation
This setting translates to the following bitmap:
xxxx xxxx xxxx xxxx 0000 0000 0001 0101
• Bit 0 = 1—Enables G.711 silence suppression (VAD)
• Bit 2 = 1—Enables Fax CED tone detection and switchover upon detection
• Bit 4 = 1, Bit 5 = 0—DTMF transmission method = out-of-band through negotiation
• Bit 6 = Bit 7 = 0—Hookflash transmission method = disable sending out hookflash
Note The values XXXX in the example apply to the Phone 2 port of the Cisco ATA.
To configure the same value for the Phone 2 port of the Cisco ATA, the value would be
0x0015XXXX.
The configuration of one port is independent from the configuration of the other port.