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https://www.cisco.com/c/en/us/products/unified-communications/unified-survivable-remote-site-telephony/index.html
For enterprise branch offices, Enhanced Cisco Unified Survivable Remote Site Telephony (E-SRST) offers: Improved user experience in failover mode by maintaining phone displays and through an enhanced feature set; GUI interface to provision, monitor, report on, and troubleshoot remote sites
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 · For the most up-to-date information about Cisco Unified IP Phone support, the maximum number of Cisco Unified IP Phones, the maximum number of directory numbers (DNs) or virtual voice ports, and memory requirements for Cisco Unified SRST and Cisco Unified SIP SRST, see Cisco Unified SRST Supported Firmware, Platforms, Memory, and Voice Products.
https://community.cisco.com/t5/ip-telephony-and-phones/configure-srst-fallback-support-on-cme/td-p/924723
A limited number of phone features are automatically detected at the time that call processing falls back to the Cisco Unified CME router in SRST mode, and an advantage of SRST fallback support using Cisco Unified CME is that you can choose to prebuild a Cisco Unified CME configuration that contains a number of extensions (ephone-dns) with ...
https://learningnetwork.cisco.com/thread/4910
Sep 07, 2010 · If the phone call is accross the failed wan link it is dead. If it does not, SRST will allow the call to continue with a loss of functions (hold, transfer, conference, etc). After the call has ended processing is handled by SRST. SRST basically inserts the configuration that is in the phone into a virtual-fxs to IP mapping (just as an ...
https://tools.cisco.com/security/center/resources/ip_phone_certificates
The VPN head-end can be a Cisco Adaptive Secure Appliance (ASA) or Datagram Transport Layer Security (DTLS) enabled on a Cisco IOS SSL VPN router. The encrypted traffic consists of voice and signaling. PC traffic is not encrypted by the Cisco IP phone. Cisco IP Phones models that support SSL VPN include 7942, 7962, 7945, 7965 and 7975.
https://quickview.cloudapps.cisco.com/quickview/bug/CSCuz10760
Symptom: SIP Phones do not register with the SRST router Conditions: +When around 1300 SIP phones failover to SRST, most of them fail to register +The SRST router shows that (most of the) phones as registered +When SRST is simulated with only a few phones, all works well
http://www.ciscopress.com/articles/article.asp?p=2492950&seqNum=3
Mar 05, 2016 · Survivable Remote Site Telephony. All Cisco endpoints register with CUCM by default unless there is another call control that can support the same or if an endpoint has specific call control requirements (for example, video endpoints that register with VCS). In the unlikely event of a WAN failure, the remote site endpoints need a backup call ...
https://quickview.cloudapps.cisco.com/quickview/bug/CSCus32216
Feb 16, 2018 · Symptom: Phones are not falling back to CUCM after DNS timeout on the phone in a DNS enabled environment. Conditions: The phones which go in to SRST mode does not register back to CUCM once the services are up. the issue is noticed when the phone uses DNS name for CUCM and resets after falling back to SRST mode. When the DNS is not reachable the phone tries to look for …
http://www.ciscopress.com/articles/article.asp?p=1744068&seqNum=4
Aug 25, 2011 · Cisco Unified SRST ensures that Cisco Unified IP Phones offer continuous service by providing call-handling support directly from the Cisco Unified SRST router using a basic set of call-handling features, as shown in Figure 5-4.
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