NetComm V85 manual PSTN-to-VoIP Services, What is SIP?

PSTN-to-VoIP Services

This is part of a full-service VoIP plan that also provides a real-world telephone number instead of just a virtual VoIP (telephone) number. Normally these plans have a monthly subscription fee and enable you to make free calls to other subscribers on the same VoIP service and also to make and receive calls from PSTN numbers local, Interstate and International through a ‘gateway’ service. Charges made for calls going through the Gateway service are a fraction of normal PSTN service charges, hence the saving

What is SIP?

You will often see references to SIP or SIP Service Providers. SIP is the Internet protocol which manages VoIP connections; a VoIP Service Provider will have a ‘SIP Server’ which maps device IP addresses against telephone numbers and enables the connection to be made between PSTN and Internet. For more information, check the NetComm website.

V85 Desktop VoIP Phone User Guide	5
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