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- VPN   

- Firewalls   

- SIP Firewalls   
Where to buy
VoIP Solutions
Partner login

Learn more, SIP Links
The SIP Protocol
IETF RFC 2543 - Formal specification for the Session Initiation Protocol).
SIP at Columbia University
SIP Working Group Supplemental Home Page

SIP Services
SIPCall - SIPCall enables SIP users to make and receive telephone calls to and from the telephone network (PSTN) irrespective of their geographical location. - Make free calls over your Broadband connection to any other Gossiptel user and more than a million other Internet telephony users worldwide!

WX3 - WX3 is a Swedish SIP service. Get your own SIP address and a local telephone number. Call to and from the telephone network (PSTN).

SIP Vendors
Hotsip - Global leader in Presence and SIP based Communication Products

SIP Capable Firewalls
SOHO Market - Intertex Firewalls and Routers
Enterprise Market - Ingate Firewalls
Enterprise Market - Ingate SIParators™ (SIP enabling existing firewalls)

SIP User Agents (Phones and Softphones)
Snom - IP Telephones
ipDialog - SipTone™ Ethernet Phone
Xten - SIP Softphones
ipDialog - SipTone™ Ethernet Phone
Windows Messenger - SIP-based voice, IM and video communication tool.

SIP Forums
SIP Forum
SIP Center

Get a Free SIP Address
Free World Dialup - a closed IP-telephony community providing free FWD phone numbers

SIP Directories - SIP411 is dedicated to enhancing the growth of the SIP industry and user community.
The Free SIP Directory
World Wide SIP Directory - Powered by Tech Arena

This is just some examples of SIP products and services on the market today. Vist the SIP product list at for a more detailed list.

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