SIP

BaseVoice

basevoice.com

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

159 visits Dec 24, 2025 Details

Brekeke Software

brekeke.com

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

94 visits Mar 31, 2025 Details

eSMS.com

esms.com

Provides UK phone numbers which forward calls to SIP.

209 visits Nov 27, 2025 Details

Free IP Call

freeipcall.com

A proxy service provider with information in English and French.

197 visits Dec 16, 2024 Details

LignUp Corp

lignup.com

Applications developer. Products include software PBX's for enterprise and service providers.

178 visits Aug 21, 2025 Details

OpenSER

openser.org

A branch of the SIP Express Router project, offering an open-source SIP server.

438 visits Mar 24, 2025 Details

pulver.com

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

414 visits Apr 19, 2026 Details

Session Initiation Protocol (SIP)

cs.columbia.edu

FAQs, background materials and lists of current work in this field.

246 visits Feb 25, 2026 Details

SIP Forum

sipforum.org

A membership based forum. Also contains a news board.

168 visits Dec 5, 2024 Details

SIP Made Easy

geocities.com

An introductory tutorial talks about protocol functions, components, message types, how it works and where it is applied.

485 visits Jul 7, 2025 Details

SIPquest Inc.

sipquest.com

Software component developer for service providers and telecom equipment vendors.

246 visits Sep 16, 2024 Details

Tech Invite

tech-invite.com

Portal containing links to technical information and RFC documentation.

136 visits Jul 25, 2025 Details

VoIP User

voipuser.org

Consumer guide and forum. Also has software phone downloads and links to service providers.

142 visits Feb 6, 2024 Details

Category Info