IP Phones are currently registered across the internet to Cisco PhoneProxy -There is IPSec Site-to-Site VPN in place for Data Traffic "only"
I want to setup SRST on the local router incase connectivity is lost btwn the ip phone(s) and the phoneproxy and/or the phoneproxy and call manager.
How will the ip phone(s) treat SRST if any of the above scenarios are introduced?
Since the PhoneProxy rewrite the XML files on the phone - Is it possible to have SRST in this design scenario?
You need a minimum of SRST 4.1 to support these two IP Phone models;
Cisco Unified SRST 4.1 Supported Firmware, Platforms, Memory, and Voice Products
Have a look at this extract from:
Cisco Unified Survivable Remote Site Telephony