Yate (Yet Another Telephony Engine) is is a next-generation telephony engine; while currently focused on Voice over Internet Protocol (VoIP) and PSTN, its power lies in its capability to be easily extended. Voice, video, data and instant messenging can all be unified under Yate's flexible routing engine, maximizing communications efficiency and minimizing infrastructure costs for businesses.

Yate can be used as a:
1. VoIP server
2. VoIP client
3. Conference server - with up to 200 channels in a single conference
4. VoIP to PSTN gateway
5. PC2Phone and Phone2PC gateway
6. IP Telephony server and/or client
7. ISDN passive and active recorder
8. ISDN, RBS, analog passive recorder
9. SS7 switch
10. Call center server
11. IVR engine
12. Prepaid and/or postpaid cards system

IP Telephony server and/or client:
1. H.323 gatekeeper
2. H.323 multiple endpoint server
3. H.323<->SIP Proxy
4. SIP session border controller
5. SIP router
6. SIP registration server
7. IAX server and/or client
8. Jingle client or server
9. MGCP gateway or server

Installing Yate on Windows
1. Download and install Yate. The other option is to download Yate from CVS and to compile by yourself. You will need Visual Studio 2005 and yate-tables.zip - decompress the files to the engine\tables directory.
2. Install Yate by following the setup.
3. If you are using a Sangoma card don't forget to first install the motherboard drivers, then Sangoma drivers, and then Yate with Sangoma drivers support. You can find a guide here about how to install Sangoma on Windows for Yate. Sangoma drivers can be downloaded here
4. If you are using Windows 2000,2003,XP then Yate will install a service. Yate can be configured by edit files from directory conf.d. More documentation about what those files should contain can be found here. To reload the configuration use YateGUI or remote connection to address 127.0.0.1 port 5038.

The license of this software is Free, you can free download and free use this phone software.