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I worked with trixbox in the past and it's really nice. There is a free version (trixbox ce) and it's based on asterisk so highly customisable.<br />
<br />
It's also compatible with a lot of FXO / FXS / T1 card if needed.
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I worked with trixbox in the past and it's really nice. There is a free version (trixbox ce) and it's based on asterisk so highly customisable.

It's also compatible with a lot of FXO / FXS / T1 card if needed.

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Thank you for your assistance. I have read about asterisk and the solution provided fully comply with my requirements.
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Thank you for your assistance. I have read about asterisk and the solution provided fully comply with my requirements.

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Dear Experts,<br />
<br />
What is the best free VOIP software and Hardware (or cheap solution) that allows VOIP comunications with access to external analog phone lines.<br />
<br />
Thank you
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Dear Experts,

What is the best free VOIP software and Hardware (or cheap solution) that allows VOIP comunications with access to external analog phone lines.

Thank you

Free VOIP solution

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).