sipc, a Multi-function SIP User Agent

Abstract

Abstract. Integrating multiple functions into one communication user agent can introduce many innovative communication services. For example, with networked appliance control, a user agent can turn off the stereo when receiving an incoming call. With location sensing, a user agent can automatically reject a call if it knows the location preference is 'quiet'. Multi-function interactions enable services that are otherwise impossible. In this paper, we first present the new services introduced by the integration, then introduce our SIP user agent, SIPC, which handles these new services in a programmable way. SIPC integrates multimedia call setup, networked appliance control, presence handling, Internet TV, instant messaging, location sensing, networked resource discovery, third-party call control, real-time multimedia streaming, emergency call handling, and conference floor control into one application. We analyze the relationship among these functions and propose different approaches for function integration. SIPC uses the Session Initiation Protocol (SIP) for multimedia call setup and the Language for End System Services (LESS) for service programming.

LoST: A Protocol for Mapping Geographic Locations to Public Safety Answering Points

“…We have integrated a Tcl-based LoST client into sipc [19], our SIP-based multimedia client, to demonstrate how end systems can perform location mappings. The LoST server was implemented using Java, running on the Apache Axis2 SOAP stack running within Tomcat.…”

The SIMPLE Presence and Event Architecture

“…The effort in the SIMPLE working group is close to offering a comprehensive architecture for advanced presence services. We have implemented [30,31] parts of this architecture in a communication client.…”

A VoIP emergency services architecture and prototype

“…The conference server accepts the INVITE and sends a 200 OK with SDP2' (11). The controller sends an ACK to the conference server (12), then puts SDP2' in its ACK to the call taker (13). Now the call taker can also talk to the conference server (14).…”

“…Similarly, Arai and Kawanishi are pursuing VoIP emergency services requirements in Japan [9]. Within Columbia University, we have spent some time working on the VoIP emergency services problem [11], [12], [13], [14].…”