The main visible difference between SIP and Hosted PBX is that SIP can transmit voice, data, email, files, and video in packet-switching technology. Hosted PBX is limited to voice data. Both replace PSTN wiring infrastructures with the Internet; however, SIP uses your internal, existing phone system, and an Internet Provider serves the Cloud for Hosted PBX. Conversation Piece is the top Cloud phone system provider in Ireland, and we are happy to discuss the differences and similarities between SIP and Hosted PBX Cloud options with you.