Prerequisites For Configuring Cisco Unified Sccp Srst - Cisco CP-7911G-CH1 System Administrator Manual

Cisco Unified SCCP SRST
Figure 1

On H.323 gateways for SCCP SRST, when the WAN link fails, active calls from Cisco Unified IP phones
to the PSTN are not maintained by default. Call preservation may work with the no h225 timeout
keepalive command.
Under default configuration, the H.323 gateway maintains a keepalive signal with Cisco Unified
Communications Manager and terminates H.323-to-PSTN calls if the keepalive signal fails, for
example, if the WAN link fails. To disable this behavior and help preserve existing calls from local
Cisco Unified IP phones, you can use the no h225 timeout keepalive command. Disabling the keepalive
mechanism only affects calls that will be torn down as a result of the loss of the H.225 keepalive signal.
For information regarding disconnecting a call when an inactive condition is detected, see the
Inactive Call Detection

Prerequisites for Configuring Cisco Unified SCCP SRST

Before configuring Cisco Unified SRST, you must do the following:
•
•
•
Cisco Unified SCCP and SIP SRST System Administrator Guide
14
Branch Office Cisco Unifed IP Phones Connected to a Remote Central Cisco Unified
Communications Manage Operating in SRST Mode
Telephone Telephone
Fax
IP IP
document.
You have an account on Cisco.com to download software.
To obtain an account on Cisco.com, go to
You have purchased a Cisco Unified SRST license.
To purchase a license, go to http://www.cisco.com/cgi-bin/tablebuild.pl/ip-key.
–
– To activate cme-srst feature license, see the
Choose an appropriate Cisco Unified SRST version. Each SRST version supports a specific set of
IP phones, memory requirements, features, and DNs. See the
section on page 24 and the
page 17.
Cisco Unified SRST
router
IP
Cisco IP phones
PCs
www.cisco.com
Activating CME-SRST Feature License
"Restrictions for Configuring Cisco Unified SCCP SRST" section on
Cisco Unified SCCP and SIP SRST Feature Overview
Cisco Unified
Communications
PSTN
IP
network
WAN
disconnected
and click Register at the top of the screen.
"Platform and Memory Support"
Central
Manager
V
Media
document.
OL-13143-04