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V85 Desktop VoIP Phone User Guide 5
YML772 Rev1
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.