With web2contact, you can work from anywhere. You can therefore choose where your calls will be sent :
The WEB line allows you to use the integrated webphone. You can call with a headset plugged into your computer
The SIP line allows you to send your calls to an IP telephone compatible with the SIP protocol. This requires manual configuration to be performed on the IP phone
The PSTN line allows you to send your calls to your landline or mobile phone. Your number is to be specified in “My profile” / Field “Telephone”