Web Directory by Internet-Web-Directory.com

Commercial software development company that produces PBX, router, proxy and application server software.

Products for small to medium sized offices and a server database.

German vendor offering hardware and software products.

A proxy service provider with information in English and French.

A USA based proxy service provider and supplier of hardware phones and routers. Site contains call rates and service details.

Sells off the shelf code for SIP, SDP and RTP protocols and provides a software consultancy service

News and reviews of hardware, software and service providers in the United States.

A collection of information on the protocol. Contains news, reports and an IP telephony job noticeboard.

A membership based forum. Also contains a news board.

A Yellow Pages style directory of SIP addresses.