protocols - Are there alternatives to SIP Trunking? -


i'm not sure if stackoverflow question but,

to understanding sip trunking voip protocol allows person call through phoneline , datacenter convert internet call.

my question is, protocol? there other protocols can used voip?

there exists technology known pri. both pri (primary rate interface)and sip(session initiating protocol) used connect business public pstn networks. pri , sip both needs physical connection pstn network. problem more conventional in such way uses circuit switched model , support voice messages. sip uses existing data channel , uses packet switched model communication, can send voice , fax messages through sip. in business point of view, sip more scalable , profitable compared pri service(even though pri offers more quality voice service). traditionally fixed line vs sip configuration

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