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VoIP, 2 Ports Analog Telephone Adapter, VoIP Phone Adapter Support SIP V2 Protocol DHCP, PAP2T Internet Phone Adapter with RJ45 Network Cable for Linksys (US Plug)Amazon$32.19
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VoIP Gateway, Portable 2 Ports Adapter Internet Phone Gateway SIP RJ45 Cable Support SIP V2 Protocol for PAP2T(US Plug)Amazon$53.49
VoIP Gateway, PAP2T-NA PAP2T 2 Ports Internet Phone Adapter, with Power Adapter, Comes with RJ-45 Network Cable, for Linksys, Support SIP V2 ProtocolAmazonSAVE $16.00
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Internet Communications Using SIP: Delivering VoIP and Multimedia Services with Session Initiation ProtocolAmazon