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https://community.cisco.com/t5/collaboration-voice-and-video/srst-support-for-sip-phones/ta-p/3123567
You can use SIP SRST for SIP IP phones. Cisco Unified SIP SRST provides backup to an external SIP proxy server by providing basic registrar and redirect server or back-to-back user agent (B2BUA) services. These services are used by a SIP IP phone in the event of a …
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 · Cisco Unified SIP SRST can support SIP phones with standard RFC 3261 feature support locally and across SIP WAN networks. With Cisco Unified SIP SRST, SIP phones can place calls across SIP networks in the same way as SCCP phones. Cisco Unified SIP SRST supports the following call combinations: SIP phone to SIP phone
https://www.cisco.com/c/en/us/products/collateral/unified-communications/unified-survivable-remote-site-telephony/data_sheet_c78-678873.html
May 19, 2016 · The Cisco Unified SRST router uses the proprietary SCCP protocol to register the SCCP phones and the SIP registrar services to support SIP phones. Cisco Unified SRST offers fault monitoring using Simple Network Management Protocol (SNMP) with the SRST MIB, which allows you to remotely monitor the Cisco Unified SRST site using existing SNMP ...
https://flylib.com/books/en/2.285.1/sip_srst.html
SIP SRST allows a Cisco voice gateway to provide SRST support to SIP phones that are registered to a SIP proxy server. To accomplish this, the SIP SRST gateway acts as a SIP registrar. Ideally, the SIP phone should support dual registration. This allows it to be registered with the SIP proxy server and the SIP SRST gateway simultaneously.
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
https://learningnetwork.cisco.com/thread/74549
Dec 28, 2014 · I have gotten SRST to work in my lab for my sip phones. But once registered to the gateway, they cant call anything. I have the below config on my router. At a minimum, I'd like the phones to be able to call each other and call 911 while in SRST mode. What am I missing? If I pick up the phone and press any digit, the phone just hangs up (no error).
https://www.youtube.com/watch?v=9svGCnjCk3g
May 24, 2016 · At the bottom of these Notes I have steps on how to setup SRST for SIP phones as well. I have not been able to test the SIP SRST configuration as we do not have SIP phones at any of our remote sites.Author: W00DY1848
http://benmorgan.com.au/blog/sip-srst-the-basics/
Mar 05, 2014 · Also we will need to allow the ISR to connect SIP to SIP endpoints or call legs. voice service voip allow-connections sip to sip. Lets look at enabling SRST for SIP Endpoints. Enter into the SIP Telephony Mode. voice register global. Default SIP Telephony mode is SRST mode, so we need do not need to change anything here, however the command is ...
http://www.ciscopress.com/articles/article.asp?p=1744068&seqNum=4
Aug 25, 2011 · If SIP phones located at remote sites at the edge of the VoIP network lose connectivity to the network core (because of a WAN outage), they may be unable to make or receive calls. Cisco Unified SIP SRST functionality on a SIP PSTN gateway provides service reliability for SIP-based IP Phones in the event of a WAN outage.
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