Specifications

23-6
Cisco Unity Express Voice-Mail and Auto-Attendant CLI Administrator Guide for 3.0 and Later Versions
OL-14010-09
Chapter 23 Configuring Your Cisco IOS Gateway for T.37 On-Ramp and Off-Ramp Fax Support
Configuration Options
Using Connect First Mode with Single DID
The Cisco Unity Express relies on the fax detection application to support single DID functionality. The
fax detection application has a limitation that causes the fax call to get disconnected and requires the fax
to be resent when the either of the following sequences occur:
• Sequence 1:
– A fax call comes through the gateway (with fax detection application configured to work in
connect first mode).
– The phone rings.
– A subscriber picks up the call and disconnects the call before the application detects it is the fax
call.
• Sequence 2:
– A fax call comes through the gateway (with the fax detection application configured to work in
connect first mode).
– The phone rings.
– A subscriber picks up the call and hears CNG tones.
– When a subscriber tries to transfer the call to fax dial peer (MMoIP), the fax call is
disconnected.
To completely understand this use of the connect first mode with a single DID, you must first understand
the high-level fax call flow. Figure 23-4 shows the various stages in the fax call, with each call flow
labeled to indicate the corresponding step described in detail below.
Note This scenario assumes that the fax detection application running on the IOS gateway.