Cisco Unified Survivable Remote Site Telephony

Cisco Unified Survivable Remote Site Telephony (SRST) does not depend  upon Cisco Unified Communications Manager, but supports phone loads. Use  the SRST documentation roadmap to determine which phones are supported  in each release of Cisco Unified Communications Manager.

Table 60     Cisco Unified Survivable Remote Site Telephony Compatibility  with Cisco Unified Communications Manager Release 3.x through Release  8.x

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/compat/ccmcompmatr.html#wp56873

CUCM and the phones are really never aware of what SRST version you have, they just know the ISR is SRST enabled and that's all they need to know.

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