Implementing Call Park and Retrieve using the Session Initiation Protocol (SIP)

Document Type Expired Internet-Draft (individual)
Author Michael Procter 
Last updated 2009-06-08
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Call Park and Call Retrieve are useful telephony services that are familiar to many users. Existing implementations using the Session Initiation Protocol (SIP) show that a variety of approaches can be taken, with varying degrees of interoperability. This draft discusses a number of feature variations, and how they may be implemented using existing techniques. An additional URI parameter is also described, which enables further common use-cases to be implemented.


Michael Procter (

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