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I am looking to set up voip in our UK home business where one line will be business and the other personal. &nbsp;I have nearly selected our provider and in picking the handsets I came across the distinction between VOIP phones which support SIP and some which do not. &nbsp;I understand that a SIP phone does not need to use a hosted PBX service. &nbsp;Can someone please elaborate on this? 
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I am looking to set up voip in our UK home business where one line will be business and the other personal.  I have nearly selected our provider and in picking the handsets I came across the distinction between VOIP phones which support SIP and some which do not.  I understand that a SIP phone does not need to use a hosted PBX service.  Can someone please elaborate on this? 

VOIP Phones: IP PBX versus SIP what is the difference

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).

Voice Over IP

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.