Specifications
Overview of Cisco IOS SRST
Prerequisites for Configuring Cisco SRST
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Cisco IOS Survivable Remote Site Telephony Version 3.4 System Administrator Guide
Integrating Cisco SRST with Cisco CallManager
There are two procedures for integrating Cisco SRST with Cisco CallManager. Procedure selection
depends on the Cisco CallManager version that you have.
If You Have Cisco CallManager V3.3 or Later
If you have Cisco CallManager V3.3 or later, you must create an SRST reference and apply it to a device
pool. An SRST reference is the IP address of the Cisco SRST router.
Step 1 Create an SRST reference.
a. From any page in Cisco CallManager, click System and SRST.
b. On the Find and List SRST References page, click Add a New SRST Reference.
c. On the SRST Reference Configuration page, enter a name in the SRST Reference Name field and
the IP address of the Cisco SRST router in the IP Address field.
d. Click Insert.
Step 2 Apply the SRST reference or the default gateway to one or more device pools.
a. From any page in Cisco CallManager, click System and Device Pool.
b. On the Device Pool Configuration page, click on the desired device pool icon.
c. On the Device Pool Configuration page, choose an SRST reference or “Use Default Gateway” from
the SRST Reference field’s menu.
If You Have Cisco CallManager Prior to V3.3
If you have firmware versions that enable Cisco SRST by default, no additional configuration is required
on CallManager to support Cisco SRST. If your firmware versions disable Cisco SRST by default, you
must enable Cisco SRST for each phone configuration.
Step 1 Go to the Cisco CallManager Phone Configuration page.
a. From any page in Cisco CallManager, click Device and Phone.
b. In the Find and List Phones page, click Find.
c. After a list of phones appears, click on the desired device name.
d. The Phone Configuration appears.
Step 2 In the Phone Configuration page, go to the Product Specific Configuration section at the end of the page,
choose Enabled from the Cisco SRST field’s menu, and click Update.
Step 3 Go to the Phone Configuration page for the next phone and choose Enabled from the Cisco SRST field’s
menu by repeating Step 1 and Step 2.