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https://www.cisco.com/c/en/us/products/unified-communications/unified-survivable-remote-site-telephony/index.html
SRST and E-SRST take full advantage of a remote site's existing network to provide multi-feature redundancy for centralized Cisco call-processing deployments during WAN link failures. SRST and E-SRST work with Cisco Unified Communications Manager and Cisco Business Edition packaged collaboration solutions.
https://www.cisco.com/c/en/us/support/routers/3945-integrated-services-router-isr/model.html
Oct 13, 2009 · Secure Voice on Cisco Integrated Services Routers; Cisco 1861 and Cisco 2800, 3800, 2900, 3900, and 3900E Series Integrated Services Router Interoperability with Cisco Unified Communications Manager Data Sheet (PDF - 1 MB) Cisco ISR & ASR Application Experience Routers Ordering Guide (PDF - 158 KB) End-of-Life and End-of-Sale Notices. English
https://www.cisco.com/c/en/us/support/routers/2921-integrated-services-router-isr/model.html
Oct 13, 2009 · Secure Voice on Cisco Integrated Services Routers; Cisco 1861 and Cisco 2800, 3800, 2900, 3900, and 3900E Series Integrated Services Router Interoperability with Cisco Unified Communications Manager Data Sheet (PDF - 1 MB) Cisco ISR & ASR Application Experience Routers Ordering Guide (PDF - 158 KB) End-of-Life and End-of-Sale Notices. English
https://community.cisco.com/t5/other-collaboration-subjects/srst-support-on-cisco-3845-router/td-p/1097784
Solved: Hi All, We have a cisco 3845 router and we are trying to figure out,what all hardware/software components required to configure SRST on this router. Any help would be appreciated. Thanks Regards Anantha Subramanian Natarajan
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusrst/admin/sccp_sip_srst/configuration/guide/SCCP_and_SIP_SRST_Admin_Guide/srst_overview.html
Aug 12, 2019 · Note Cisco Unified CM fallback mode telephone service is available only to those Cisco Unified IP phones that are supported by a Cisco Unified SRST router. Other Cisco Unified IP phones on the network remain out of service until they re-establish a connection with their primary, secondary, or tertiary Cisco Unified CM.
https://www.cisco.com/c/en/us/products/collateral/unified-communications/unified-survivable-remote-site-telephony/data_sheet_c78-678873.html
May 19, 2016 · Cisco Unified SRST functions in the remote-location router to automatically detect a failure in the network and initiate a process to provide call-processing backup redundancy for the IP phones in that location and help ensure that the telephony capabilities stay operational.
https://community.cisco.com/t5/collaboration-voice-and-video/how-to-implement-cisco-unified-srst-and-mgcp-fallback/ta-p/3113024
Cisco Unified SRST provides CUCM with fallback support for Cisco Unified IP Phones that are attached to a Cisco router on a local network. Cisco Unified SRST enables routers to provide basic call-handling support for Cisco Unified IP Phones when they lose connection to remote primary, secondary and teritiary CUCM servers or when the WAN ...
https://community.cisco.com/t5/routing/installing-srst-licenses-on-cisco-4331/td-p/3854056
the CME -SRST is considered a feature license each node on which you want to have it must have the uck9 technology package license. Being a feature license if you want to support a different number of phones in SRST on each router I think you should install the appropriate license on each router.
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