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[3] [4] The OSI does not endorse FSF license analysis (interpretation) as per their disclaimer. [5] The FSF's Free Software Definition focuses on the user's unrestricted rights to use a program, to study and modify it, to copy it, and to redistribute it for any purpose, which are considered by the FSF the four essential freedoms.
For residential users, VoIP services typically provide significant cost advantages compared to traditional public switched telephone network (PSTN) services. These systems eliminate geographic restrictions on phone numbers, enabling users to maintain local numbers in any area code regardless of their physical location.
pfSense, a firewall/router distribution based on FreeBSD and PF; has QoS that properly tags VoIP traffic and a SIP proxy package that is available for NATed endpoints. Its functionality can be expanded with packages like FreeSWITCH, a free/open source software communications platform for making SIP, voice and chat driven products.
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Yate ( Yet Another Telephony Engine) is a free and open source communications software with support for video, voice and instant messaging. It is an extensible IP PBX under the GPLv2 with linking exception license. [3]
Free and open-source software portal This category is for packages that implement VOIP and are free software - that is to say that the source code is available under a free software licence . Subcategories