Simple Gateway Control Protocol (SGCP)

Document Type Expired Internet-Draft (individual)
Last updated 1998-09-25
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This document describes an application programming interface (SGCI) and a corresponding protocol (SGCP) for controlling Voice over IP (VoIP) Gateways from external call control elements. The SGCP assumes a call control architecture where the call control 'intelligence' is outside the gateways and handled by external call control elements. The document is structured in 5 main sections: * The introduction presents the basic assumptions and the relation to other protocols such as H.323, RTSP, SAP or SIP. * The interface section presents a conceptual overview of the SGCP, presenting the naming conventions, the usage of the session description protocol SDP, and the five procedurs that compose SGCP: Notifications Request, Notification, Create Connection, Modify Con- nection and Delete Connection. * The protocol description section presents the SGCP encodings, which are based on simple text formats, and the transmission procedure over UDP. * The security section presents the security requirement of SGCP, and its usage of IP security services (IPSEC). * An example section presents two detailed examples of call set up procedures using SGCP. * The description of the changes between version 1.0 and version 1.1


Christian Huitema (
Mauricio Arango (

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