Specifications

6-5
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for SCCP (version 3.0)
OL-4652-01
Chapter 6 Configuring and Debugging Fax Services
Using Fax Pass-through Mode
Step 3 For the Cisco ATA ConnectMode parameter, turn off bits 14 and 15. 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.
Dial-Peer Level Commands
You can enable fax pass-through mode for communication between a Cisco IOS gateway and the
specified Cisco
ATA using the following dial-peer level commands:
Procedure
Step 1 Perform the command:
dial-peer voice tag voip
Step 2 Perform the command:
modem passthrough {NSE [payload-type number] codec {g711μlaw | g711alaw} [redundancy] |
system}
a. The default of this command is:
modem passthrough system
When using the default configuration, the dial-peer fax pass-through configuration is defined by the
voice service voip command. When the system option is used, no other parameters are available.
When the NSE is configured in the fax pass-through command at the dial-peer level, the fax
pass-through definition in the dial-peer command takes priority over the definition in the voice
service voip command.
b. The payload-type number, codec, and redundancy parameters can also be used.
For example, the command:
modem passthrough NSE codec g711μlaw
means that the Cisco ATA will use the NSE payload-type number 100, G.711μ-law codec, and no
redundancy in fax pass-through mode.
Step 3 When setting up dial-peer for fax pass-through, it is necessary to set up a pair of dial-peers for inbound
and outbound calls between the Cisco
ATA and Cisco IOS gateways. You do this by specifying the
destination-pattern and incoming-called number. The destination-pattern should point to the
Cisco
ATA, while the incoming-called number should apply to all numbers that the Cisco ATA is allowed
to dial.