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Configuring T37 Onramp

Configuring T.37 onramp allows fax calls coming into the voice port of an IOS voice gateway to be converted to an e-mail attachment. The IOS gateway handles the conversion process, whereby the incoming, standard fax page is changed into a TIFF file and attached to an outgoing e-mail.

Dial-peers are still used to route the onramp call through the voice gateway, but there are some configuration differences compared to the dial-peer configuration used for a fax relay or fax passthrough call. First, the incoming plain old telephone service (POTS) dial-peer refers to an onramp TCL script for processing the call. Second, a MMoIP dial-peer is used for communicating with the e-mail server as opposed to a VoIP dial-peer. Last of all, this outgoing MMoIP dial-peer also calls a specific onramp service application for processing the e-mail portion of the onramp fax call.

Although configuring T.37 onramp on an IOS voice gateway might seem somewhat intimidating, the onramp configuration process can be greatly simplified by breaking the task into smaller parts. The onramp configuration process is broken down into a step-by-step quick reference guide in Table 11-3.

Table 11-3 T.37 Onramp Fax Configuration Quick Reference Guide

	T.37 Onramp Configuration Step Description	Covered in Section
Step 1	Enable T.37 onramp faxing by issuing the configuration command fax interface-type fax-mail. Reload the IOS voice gateway if necessary.	"Enabling T.37 Store-and-Forward Fax"
Step 2	Load and define the onramp TCL script on the voice gateway.	"Loading the TCL Scripts"
Step 3	Define and configure an incoming POTS dial-peer for onramp faxing. This includes applying the onramp TCL script defined in Step 2 to the POTS dial-peer configuration.	"Dial-Peer Configuration for Onramp Fax"
Step 4	Define and configure an MMoIP dial-peer. This includes referencing the IOS-bundled onramp application, fax_on_vfc_onramp_app, along with other T.37-specific MMoIP dial-peer commands.
Step 5	Optionally configure the global onramp fax command fax receive called-subscriber.	"Fax Receive Configuration Command for Onramp Fax"
Step 6	Set up the e-mail portion of T.37 onramp using the appropriate Simple Mail Transfer Protocol (SMTP) and MTA commands.	"MTA Configuration Commands for Onramp Fax"

Table 11-3 breaks the configuration of T.37 onramp down into six clearly defined steps. Each of these steps is paired with a configuration subsection where you can find more detailed configuration assistance and command explanations. The step-by-step approach in Table 11-3 provides you with the best method for creating an onramp configuration in the simplest and most efficient manner possible.

TIP Onramp faxing can be combined with authentication, authorization, and accounting (AAA)

services using RADIUS or TACACS+ servers. This configuration option is not covered in this chapter. If you are interested in applying AAA services to a T.37 onramp configuration, refer to the section "Configuring Security and Accounting on the On-Ramp Gateway" in the "Configuring T.37 Store-and-Forward Fax" document located at http://www.cisco.com.

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