Specifications

Chapter 5 Configuring the Voice Interfaces
E&M Trunk Line Configuration (H.323)
5-36
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
Figure 5-2 Linking PBX Users with E&M Trunk Lines
Note This scenario assumes that the company already has established a working IP
connection between its two remote offices.
Handling Incoming Caller ID Digits on an E&M Port
When using an H.323 T1-CAS E&M port on the Catalyst 4224, Incoming
Caller ID Digits may not be processed correctly by Cisco CRA, such as Cisco IP
Auto-Attendant.
Depending on the T1-CAS line provisioning, incoming dialed number
identification service (DNIS) digits received by the Catalyst 4224 after its first
wink to the Central Office (CO) are treated as user-entered digits and are sent to
the remote endpoint as out-of-band DTMF digits. If the remote endpoint is a
Cisco CRA application, the out-of-band digits will be interpreted as a user entry
and will change the application response.
There are two ways to handle this situation:
• Ask the T1 service provider to stop sending DNIS digits.
• Configure an IP phone with the same directory number as the incoming
DNIS, then modify the "forward all" selection for this phone so that it sends
the incoming call to the desired destination.
58960
Dial peer
1 POTS
Catalyst 4224 Catalyst 4224
San Jose
(408)
Salt Lake City
(801)
Dial peer
2 POTS
PBX PBX
172.16.1.123
172.16.65.182
Voice port
1/0/0
Dial peer
1 POTS
Voice port
1/0/0
Voice port
1/0/1
Dial peer
2 POTS
Voice port
1/0/1
IP cloud
V V