TekPhone is a SIP (Session Initiation Protocol) conference server (Based on RFC 3261) runs under Windows (XP, Vista, 2003 Server). Use it just for testing environments! Do not use for production systems.
Major Features
* Simple, easy to use interface.
* Supports (Only) G.711 A - Mu law codecs.
* Supports UPnP for NAT traversal. You can also set external IP address manually.
* ENUM (RFC 37612).