HEATKEYS

Asterisk is free software that transforms a computer into a communication server. Asterisk lets you build applications like PBX, VoIP gateway, IVR and ACD.

3CX VOIP PBX - provides an easy to use, plug and play SIP - IP PABX for Windows. With a software based IP PBX you will save on PBX maintenance and halve your phone bill. Download the FREE edition today and break free from your proprietary phone syste...

Office SIP Server is free VoIP and Instant Messaging Software

Web hosting reviews, advice, and discussion on hosting related news and services. Get advice on dedicated server hosting, ecommerce systems, business web hosting, provider reviews, and web hosting industry related news..

hosted SIP servers for small business.

YouTube is a place to discover, watch, upload and share videos.

Open Source SIP Server - Kamailio (former OpenSER)

Blog about computer software, VoIP, Linux and programming.

Colocation America offers a comprehensive range of managed services, hosting and cutting-edge colocation capabilities to take infinite care of keeping your systems well connected so that you can focus on other business priorities

Elastix, the Open Source Unified Communications Server.

SIP Hosted PBX, Multi-Tenant, VoIP Platform for Service Providers - provides scalable and reliable SaaS IP Telephony Platform. Based on the Session Initiation Protocol (SIP), the Brekeke products provide robust SIP Communication Platform for Service ...