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Many companies provide SIP "origination" (outbound calling) and "termination" (inbound calling, usually with a POTS phone number, called a DID). Most companies that provide one also provide the other.
Outbound (origination) rates vary from provider to provider and can often depend quite a bit on the kind of number being called. For example, since European cell phones have "calling party pays" billing, calling a London cell number can cost over US$0.20/minute, while calling a London landline can cost under US$0.01/minute.
Inbound calling prices are more varied, particularly in the US. Some providers offer flat rate pricing "per channel" (simultaneous call leg) while some offer an unlimited number of channels but a low, fixed per-minute rate. Some providers offer a choice of plan.
In both cases, a SIP-compatible softphone or softswitch is configured to place certain (or all) outbound calls through the SIP provider; likewise, the switch or softphone is configured to register with the SIP provider to be notified when a new inbound phone call is available to answer.
List of SIP providers
- Dellmont Voip-Clones
- MyOwn Telco
- Switch2Voip Call Center VoIP
- Speedflow Communications
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