Setting Up Cisco Unified IP Phones using SCCP
How to Set Up Cisco Unified IP Phones
90
Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
Step 4
To temporarily block the TCP port 2000 Skinny Client Control Protocol (SCCP) connection for one of
the Cisco IP phones to force the Cisco IP phone to lose its connection to the
Cisco Unified Communications Manager and register with the Cisco Unified SRST router, perform the
following steps:
a.
Use the appropriate IP
access-list
command to temporarily disconnect a Cisco Unified IP Phone
from the Cisco Unified Communications Manager.
During a WAN connection failure, when Cisco Unified SRST is enabled, Cisco Unified IP Phones
display a message informing you that they are operating in Cisco Unified Communications Manager
fallback mode. The Cisco IP Phone 7960 and Cisco IP Phone 7940 display a “CM Fallback Service
Operating” message, and the Cisco IP Phone 7910 displays a “CM Fallback Service” message when
operating in Cisco Unified Communications Manager fallback mode. When the Cisco
Unified Communications Manager is restored, the message goes away and full Cisco IP phone
functionality is restored.
b.
Use the
debug ephone register
command to observe the registration process of the Cisco IP phone
on the Cisco Unified SRST router.
c.
Use the
show ephone
command to display the Cisco IP phones that have registered to the
Cisco Unified SRST router.
d.
Enter the
no
form of the appropriate
access-list
command to restore normal service for the phone.
Configuring IP Phone Clock, Date, and Time Formats
The Cisco Unified IP Phone 7970G and Cisco Unified IP Phone 7971G-GE IP phones obtain the correct
timezone from Cisco Unified Communications Manager. They also receive the Coordinated Universal
Time (UTC) time from the SRST router during SRST registration. When in SRST mode, the phones take
the timezone and the UTC time, and apply a timezone offset to produce the correct time display.
Cisco IP Phone 7960 IP phones and other similar SCCP phones such as the Cisco IP Phone 7940, get
their display clock information from the local time of the SRST router during SRST registration. If the
Cisco Unified SRST router is configured to use the Network Time Protocol (NTP) to automatically sync
the Cisco Unified SRST router time from an NTP time server, only UTC time is delivered to the router.
This is because the NTP server could be physically located anywhere in the world, in any timezone. As
it is important to display the correct local time, use the
clock timezone
command to adjust or offset the
Cisco Unified SRST router time.
The date and time formats that appear on the displays of all Cisco Unified IP Phones in Cisco Unified
CM fallback mode are selected using the
date-format
and
time-format
commands as configured below:
SUMMARY STEPS
1.
clock timezone
zone hours-offset
[
minutes-offset
]
2.
call-manager-fallback
3.
date-format
{
mm-dd-yy
|
dd-mm-yy
|
yy-dd-mm
|
yy-mm-dd
}
4.
time-format
{
12
|
24
}
5.
exit
