Cisco CP-7911G-CH1 Administration Guide - Page 90

How to Set Up Cisco Unified IP Phones Setting Up Cisco Unified IP Phones using SCCP 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 Cisco Unified SCCP and SIP SRST System Administrator Guide 90 OL-13143-04