Check that link first please:
http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_configuration_guide_chapter09186a00806a7fe8.html
Sample config of CME&SRST from CCO:
The following example shows a Cisco Unified CME system at 10.1.68.78 that is being used to provide SRST fallback services for 30 ephones.
telephony-service
srst mode auto-provision all
srst ephone template 5
srst ephone description srst fallback auto-provision phone
srst dn template 8
srst dn line-mode dual
max-ephones 30
max-dn 60
ip source-address 10.1.68.78 port 2000
max-redirect 20
system message ''SRST Mode: Cisco Unified CME'
keepalive 10
max-conferences 8 gain -6
moh welcome.au
create cnf-files version-stamp Jan 01 2002 00:00:00
!
ephone-dn 1 dual-line
number 7001
label 7001
description 7001
name 7001
ephone-dn-template 5
This DN is learned from srst fallback ephones
!
!
ephone-dn 2 dual-line
number 4005
description 4005
name 4005
ephone-dn-template 5
This DN is learned from srst fallback ephones
!
!
ephone-dn 3 dual-line
number 4002
label 4002
description 4002
name 4002
ephone-dn-template 5
This DN is learned from srst fallback ephones
!
!
ephone 1
description srst fallback auto-provision phone
ephone-template 5
mac-address 100A.7052.2AAE
button 1:1 2:2
!
!
ephone 2
description srst fallback auto-provision phone
ephone-template 5
mac-address 1002.CD64.A24A
type 7960
button 1:3
