SIP for Click-To-Dial-Back and Third-Party Control

Document Type Expired Internet-Draft (pint WG)
Author Henning Schulzrinne 
Last updated 1997-11-24
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


SIP can also be used to control calls established by other entities, for example, to have a computer control a PBX or a web server ask an SCP to initiate a call to a standard telephone (''click-to-dial- back''). We refer to the entity initiating the phone call as the controller and the PBX or SCP as the PSTN server.


Henning Schulzrinne (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)