CUCM SRST Configuration
CUCM SRST configuration is similar for both Cisco Unified SRST or Cisco Unified CME-based SRST. The IOS router must be defined as an SRST reference in CUCM. Then this SRST reference consecutively needs to be added to the appropriate device pool to enable the phones at remote sites to leverage SRST. To configure an SRST reference and add it to a device pool, follow these steps:
Step 1. Go to CUCM Administration GUI > System > SRST, click Add New, and enter the required details about the remote site gateway, as shown in Figure 5-5. Ensure that the SRST gateway’s hostname/IP address is defined and the correct protocol (SCCP/SIP) port is chosen. If the gateway is referenced by hostname, be sure that CUCM can resolve the name and has DNS servers configured.
Figure 5-5 Cisco SRST Reference Configuration
- Step 2. Browse to System > Device Pool and select a device pool for remote site phones. Let’s assume that you have created a device pool per remote site. Assign the appropriate SRST reference per device pool. Configure the SRST reference in the device pool and save the configuration.
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At this time, the CUCM part of SRST reference configuration is complete and the remote site gateway or Cisco Unified CME needs to be configured (described in earlier sections of this chapter) for SRST or E-SRST, respectively.