Call waiting with “Caller ID” uses a special signal in
order to warn you about an incoming call, during another call there are shown the
name and number of the calling subscriber on the display. The function also
allows switching between two calls.
Hosted PBX service provider in Canada.
http://pbx.tieus.com
Only $16.95/mo, unlimited calling to 20 major Canada Cities.
unlimited calling for your cell phone
http://www.magicnumber.ca