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Completion of Calls for the Session Initiation Protocol (SIP) (RFC6910) Disclosure Number: IPCOM000226560D
Original Publication Date: 2013-Apr-01
Included in the Prior Art Database: 2013-Apr-16
Document File: 74 page(s) / 86K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Worley: AUTHOR [+3]


The Completion of Calls (CC) feature allows the caller of a failed call to have the call completed without having to make a new call attempt while guessing when the callee becomes available. When the caller requests the use of the CC feature, the callee will be monitored for its availability. When the callee becomes available, the callee will be given a certain time frame for initiating a call. If the callee does not initiate a new call within this time frame, then the caller will be recalled. When the caller accepts the CC recall, then a CC call to the callee will automatically start. If several callers have requested the CC feature on the same callee, they will be recalled in a predefined order, which is usually the order in which they have requested the CC feature.

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Internet Engineering Task Force (IETF)                         D. Worley Request for Comments: 6910               Ariadne Internet Services, Inc. Category: Standards Track                                  M. Huelsemann ISSN: 2070-1721                                                R. Jesske                                                         Deutsche Telekom                                                            D. Alexeitsev                                                                TeleFLASH                                                               April 2013

      Completion of Calls for the Session Initiation Protocol (SIP)


   The "completion of calls" feature defined in this specification    allows the caller of a failed call to be notified when the callee    becomes available to receive a call.

   For the realization of a basic solution without queuing, this    document references the usage of the dialog event package (RFC 4235)    that is described as 'Automatic Redial' in "Session Initiation    Protocol Service Examples" (RFC 5359).

   For the realization of a more comprehensive solution with queuing,    this document introduces an architecture for implementing these    features in the Session Initiation Protocol where "completion of    calls" implementations associated with the caller's and callee's    endpoints cooperate to place the caller's request for completion of    calls into a queue at the callee's endpoint; when a caller's request    is ready to be serviced, re-attempt of the original, failed call is    then made.

   The architecture is designed to interoperate well with existing    completion of calls solutions in other networks.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Worley, et al.               Standards Track                    [Page 1]
 RFC 6910                   Completion of Calls                April 2013

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