Specifications

Chapter 8 Configuring Survivable Remote Site Telephony
Troubleshooting Survivable Remote Site Telephony
8-10
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
Step 4 Temporarily block the TCP port 2000 Skinny Client Protocol (SCCP) connection
for one of the Cisco IP Phones. This forces the Cisco IP Phone to lose its
connection to Cisco CallManager and register with the SRS Catalyst 4224.
Perform the following:
1. Use the appropriate access-list command to temporarily disconnect a
Cisco IP Phone from Cisco CallManager.
Note The Cisco IP Phone 7960 and 7940 display the message “CM Fallback Service
Operating” at the bottom of the display screen. The Cisco IP Phone 7910 displays
the message “CM Fallback Service” for five seconds every 30 seconds. This
message is brief because the Cisco IP Phone 7910 has a two-line display area and
the display panel is also used to display the telephone number.
2. Delete the access-list command to restore normal service for the phone by
entering the no form of the appropriate access-list command.
3. Use the debug ephone register command to observe the registration process
of the Cisco IP Phone on the SRST Catalyst 4224.
4. You can also enter the show ephone command to display the Cisco IP Phones
that have registered to the SRST Catalyst 4224.
Troubleshooting Survivable Remote Site Telephony
Use the following commands to troubleshoot the SRST feature.
Command Purpose
debug ephone keepalive
Sets keepalive debugging for the Cisco IP Phone.
debug ephone register
Sets registration debugging for the Cisco IP Phone.
debug ephone state
Sets state debugging for the Cisco IP Phone.
debug ephone detail
Sets detail debugging for the Cisco IP Phone.
debug ephone error
Sets error debugging for the Cisco IP Phone.
debug ephone statistics
Sets call statistics debugging for the Cisco IP Phone.