SIP Test Tool contains a conformance test suite for conformance testing of different SIP components such as User Agent, Proxy, Registrar, Presence and IM server. (Product Overview - January 1, 2001)

HCLT offers a comprehensive SIP Test Tool built on a generic protocol test framework (HCLT VoIP Test Framework) for testing of different SIP components such as SIP User Agent, Proxy, Registrar, Presence and IM Server. (Brochure - June 1, 2004)

HCLT offers reusable software components in SIP, as User Agent and Server. These components are well tested, ported on to multiple platforms and supports sample applications like Instant Messaging, Presence, and Voice and Video chat. (Brochure - June 1, 2004)

SIP User Agent is a logical entity at VoIP endpoints capable of initiating and answering calls between peers. SIP user agent consists of User Agent Client (UAC)and User Agent Server (UAS). (Product Overview - January 1, 2001)