Netcomm V85 Manual De Usuario

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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.