Posted by: Mudassir Ali | December 22, 2010

Cisco Unified SRST and Cisco Unified CME in SRST Fallback Mode

In “Cisco Unified CME in SRST Fallback Mode” IP phones re-home to Cisco Unified CME if Cisco Unified Communications Manager fails. CME in SRST allows IP phones to access some advanced Cisco Unified CME telephony features not supported in traditional SRST. I personally recommended Cisco CME in SRST Fallback mode, because of the advanced features and more control on the call flow.

Attached is Offline Tutorial for Cisco Communications Manager Express as Survivable Remote Site Telephony (CME-as-SRST) Tutorial

Cisco Unified CME in SRST Fallback Mode Cisco Unified SRST
First supported with Cisco Unified CME 4.0: Cisco IOS Software 12.4(9)T Supported since Cisco Unified SRST 2.0 with Cisco IOS Software 12.2(8)T5
IP phones re-home to Cisco Unified CME if Cisco Unified Communications Manager fails. CME in SRST allows IP phones to access some advanced Cisco Unified CME telephony features not supported in traditional SRST IP phones re-home to SRST router if Cisco Unified Communications Manager fails. SRST allows IP phones to have basic telephony features
Support for up to 240 phones Support for up to 720 phones
No support for Cisco VG248 48-Port Analog Phone Gateway registration during fallback Support for Cisco VG248 registration during fallback
Lack of support for alias command Support for alias command
Support for features such as Pickup Groups, Hunt Groups, Basic Automatic Call Distributor (BACD), Call Park, softkey templates, and paging €¢ Lack of support for features such as Pickup Groups, Hunt Groups, Call Park, and BACD
Support for Cisco IP Communicator 2.0 with Cisco Unified Video Advantage 2.0 on same computer No support for Cisco IP Communicator 2.0 with Cisco Unified Video Advantage 2.0
No support for secure voice in SRST mode Support for secure voice during SRST fallback
More complex configuration required Simple, one-time configuration for SRST fallback service
E-911 support with per-phone emergency response location (ERL) assignment for IP phones (Cisco Unified CME 4.1 only) No per-phone emergency response location (ERL) assignment for SCCP Phones (E911 is a new feature supported in SRST 4.1)
Support for Cisco Unity® unified messaging at remote sites (Distributed Exchange or Domino)
Support for digital signal processor (DSP)-based hardware conferencing

 

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  1. […] SRST vs CME in SRST […]


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