Specifications

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Cisco Unity Express Voice-Mail and Auto-Attendant CLI Administrator Guide for 3.0 and Later Versions
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Chapter 23 Configuring Your Cisco IOS Gateway for T.37 On-Ramp and Off-Ramp Fax Support
Configuration Options
traversing the packet network. When acting as the On-ramp gateway, the Cisco gateway receives faxes
from end users, converts them into TIFF files, creates standard MIME e-mail messages, attaches the
TIFF files to the e-mail messages, and forwards the fax-mail messages to the designated SMTP server
for storage. The gateway uses the sending MTA and dial peers to complete these tasks. The sending
MTA, which is the Cisco gateway, defines delivery parameters associated with the e-mail message to
which the fax TIFF file is attached. The delivery parameters include defining a return e-mail path or
designating a destination mail server.
Off-Ramp Faxing
With the Off-ramp process, a voice gateway handles calls going out from the network to fax machine or
the PSTN and converts a fax e-mail with TIFF attachment into a traditional fax format that can be
delivered to a standard fax machine or the PSTN. Off-ramp faxing requires that the Cisco gateway act
as an Off-ramp gateway to dial the POTS and communicate with a remote fax machine (Group 3 fax
device), using standard fax protocols. The Off-ramp gateway provides the following functionality:
• Converts a fax-mail to TIFF file (or plain text file) into a standard format and delivers it to the
recipient. The Store-and-Forward Fax application does not alter the TIFF or plain text file in any
way from its original format when converting it into a standard fax format. The Off-ramp gateway
uses the receiving MTA and dial peers to perform the conversion.
• Delivers an e-mail message as a standard fax transmission. The Cisco gateway generates
information that is appended to the top of each faxed page (text-to-fax pages) and creates a fax cover
sheet. The Off-ramp gateway uses the receiving MTA, dial peers, and commands specific to
formatting the appended information and generating a fax cover sheet to deliver e-mail messages as
fax transmissions.
• Uses only POTS dial peers to define the line characteristics between the forwarding Off-ramp
gateway and the fax device. Optionally configure the MMoIP dial peers can be configured to define
fax compression schemes and resolution. This option is useful only if those parameters are to be
altered for the received fax-mails.
• Defines the parameters associated with the gateway SMTP server, using the receiving MTAs. This
can be its SMTP host aliases, which can be different than its normal DNS hostnames, or internal
Cisco IOS hostname.
Note You can combine On-ramp and Off-ramp faxing processes on a single gateway, or you can put them on
separate gateways. Both On-ramp and Off-ramp are available with Cisco IOS Release
12.3(7) T or
higher.
Configuration Options
The following sections explain your configuration options for the Fax feature. These options are:
• Using separate DIDs for Fax with either:
– Connect first mode
– Listen first mode
• Using single DID for voice and fax with either:
– Connect first mode
– Listen first mode