@PC99 the "dial your own phone number" solution already offered here is the simplest answer, but I just wanted to add for completeness another option you can use to dial into the voicemail server without ringing your own phone. There are local access numbers in many major centres across Canada, for which I compiled a list here:
Dial your number from another phone. When your voicemail picks up press "*" and enter your 4 digit voicemail pin#. And you are in....use a voip app like textnow or fongo while on wifi to call your voicemail.
