Single point of calling
With hardware VoIP solutions it
is possible to connect the VoIP router into the existing central
phone box in the house and have VoIP at every phone already connected.
Software based VoIP services require the use of a computer, so
they are limited to single point of calling, though telephone
sets are now available, allowing them to be used without a PC.
Some services provide the ability to connect WiFi SIP phones so
that service can be extended throughout the premises, and off-site
to any location with an open hotspot.However, note that many hotspots
require browser-based authentication, which most SIP phones do
not support