Softphone Sip

OfficeSIP Alerter
Free - OfficeSIP Communications

OfficeSIP Alerter is a simple, easy-to-use and free sip messenger. It was not designed for prolonged chat, it is handy when you need to send or receive single message. It is good replacement for old-fashioned Alerter Service. OfficeSIP Alerter has simple interface but it is based on Session Initiation Protocol, so you can exchange messages with users of Windows Messenger or other sip messenger.

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Telepati SIP Phone Freeware
Free - Research Lab Inc

Telepati SIP Phone Freeware allows you to make PC-PC phone-phone calls over the Internet. Developed using Research Labs VOIP SIP Phone SDK, this free soft phone brings SIP protocol support for ActiveX. With this phone once you set the gatekeeper proxy with the username and password from your providers, you can connect and start speaking with anyone on the internet.

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Axon Virtual PBx System
Free - NCH Software

Axon is a virtual PBX designed to manage calls within a business or call center environment. Any business can implement this scalable PBX solution with only an existing PC which connects to phone lines and extensions using VoIP technology.

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Collanos Phone Linux
Free - Collanos Software Inc.

Collanos Phone is a software-only Voice over Internet Protocol (VoIP) phone and a multi-protocol instant messenger combined in one application. The main features include placing audio & video calls and sending instant messages to existing Jabber, MSN, ICQ, AOL, and Yahoo! networks. Following Collanos’ multi-platform strategy, the product is available on Windows, Mac OSX, and Linux. All basic features of Collanos Phone are available at no cost.

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