LESS: Language for End System Services in Internet Telephony

Document Type Expired Internet-Draft (individual)
Authors Xiaotao Wu  , Henning Schulzrinne 
Last updated 2005-02-17
Stream (None)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


In Internet telephony, end systems can take a large role in providing services, especially in networks without pre-configured infra-structure, such as peer-to-peer networks. Since we believe that end system services differ in their requirements from network services, we define a new service creation scripting language called the Language for End System Services (LESS). LESS inherits man characteristics from the Call Processing Language (CPL). It contains commands and events for direct user interaction and the control of media applications. This document defines the basic elements of LESS and several commonly used LESS extensions.


Xiaotao Wu (xwu@avaya.com)
Henning Schulzrinne (hgs+geopriv@cs.columbia.edu)

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