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what kind of hardware I need and software?
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what kind of hardware I need and software?

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in this website , i always heard about Asterisk , sip . may i use those software to build &nbsp; free voip?
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in this website , i always heard about Asterisk , sip . may i use those software to build   free voip?

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i know we can build the voip server by ourself. does it mean we can have free voip ?
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i know we can build the voip server by ourself. does it mean we can have free voip ?

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Do i must pay to get VoIP service ? &nbsp;if i need pay, what is the price?<br />
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in fact, i want to set up a VoIP without pay!
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Do i must pay to get VoIP service ?  if i need pay, what is the price?

in fact, i want to set up a VoIP without pay!

voip charge question!

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).