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https://wiki.freepbx.org/display/DIMG/SIP+PRACK
Feb 01, 2019 · PRACK Improves network reliability by adding an acknowledgement system to the provisional Responses (1xx). Configuration. SIP PRACK is configured in the SIP SGP object as displayed below. For information on configuring the SIP Signaling and associated functionality, refer to the Configure SIP (Single SIP IP) topic. PRACK Support
https://docs.oracle.com/cd/E95619_01/html/esbc_ecz810_configuration/GUID-CB8A3992-379A-4B41-AC95-7F7C2A6D811B.htm
When you configure your Oracle® Enterprise Session Border Controller with PRACK interworking for SIP, you enable it to interwork between endpoints that support RFC 3262, Reliability of Provisional Responses in the Session Initiation Protocol, and those that do not. As its title indicates, RFC 3262 defines a reliable provisional response extension for SIP INVITEs, which is the 100rel extension ...
https://tools.ietf.org/html/rfc3262
RFC 3262 Reliability of Provisional Responses in SIP June 2002 the UAS needs to send them more frequently (once a minute is recommended) because of the possibility of packet loss. As a more efficient alternative, the UAS can send the response reliably, in which case the UAS SHOULD send provisional responses once every two and a half minutes.Cited by: 380
https://sourceforge.net/p/cafesip/discussion/467762/thread/3808140d/
May 14, 2009 · Vaughan, Unfortunately, without a small code change workaround, I'm not seeing offhand how you can get what you need from SipCall (until PRACK support is in) to use the methods on the JAIN SIP Dialog you need to create and send the RPR.
https://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/sbcu/2_xe/sbcu_2_xe_book/sbc_100rel.pdf
100rel Interworking Support Cisco Unified Border Element (SP Edition) provides support for 100rel (SIP Provisional Message Reliability) interworking. This feature provides support to resolve the interoperability problem of inconsistent support for SIP reliable provisional re sponses encountered when SBC works with different SIP networks.
http://www.faqs.org/rfcs/rfc3262.html
All user agents that support this extension MUST support all offer/answer exchanges that are possible based on the rules in Section 13.2 of RFC 3261, based on the existence of INVITE and PRACK as requests, and 2xx and reliable 1xx as non-failure reliable responses. 6 Definition of the PRACK Method This specification defines a new SIP method, PRACK.
https://tools.ietf.org/html/rfc6337
RFC 6337 SIP Usage of the Offer/Answer Model August 2011 There may be ONLY ONE offer/answer negotiation in progress for a single dialog at any point in time. Section 4 explains how to ensure this. When an INVITE results in multiple dialogs, each has a separate offer/answer negotiation. NOTE: This is when using a Content-Disposition of "session".Cited by: 7
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