Saturday, March 15, 2008

CUCME-SRST Cheatsheet

Starting from CUCME 4.0, it provides fallback functionality to IP phones that are registered to CUCM, just like SRST, but provide more robust features like B-ACD during the fallback mode.

Some of the key points for CME-SRST mode:
  • First supported with CME 4.0 – IOS 12.4(4)XC
  • IP phones re-home to CME in event of CallManager failure & have access to advanced CME telephony features
  • Support for up to 240 ephones
  • No support for Vg248 registration during fallback
  • Lack of support for “alias” command
  • Support for Cisco Unity at remote sites (Distributed Exchange/Domino)
  • Pickup Groups, Hunt Groups, B-ACD, Call Park,Softkey templates, paging
  • Support for CIPC 2.0 with VTA 2.0 on same computer
  • No support for secure voice in SRST mode
  • Requires more complex configuration
An iPhone app for CME Config Generation:

The call-manager-fallback command, which is used to configure Cisco Unified SRST, cannot be used on a router that is configured for Cisco Unified CME

Sample Configuration:
srst mode auto-provision all
srst ephone template 1
srst ephone description CCME-SRST MODE : Oct 31 2006 19:00:20 : Nov 01 2006 00:31:17
srst dn template 1
srst dn line-mode dual
max-ephones 144
max-dn 288
ip source-address port 2000
max-conferences 8 gain -6
transfer-system full-consult
create cnf-files version-stamp Jan 01 2002 00:00:00

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