What is Asterisk?
"Asterisk is like a box of Legos for people who want to create communications applications. It includes all the building blocks needed to create a PBX, an IVR system, a conference bridge and virtually any other communications app you can imagine."
It includes a WebRTC SIP client, allowing users to make an receive phone calls with a web browser.
How to Create an Account
Password: [same as wifi]
Applications -> Extensions
Device: Generic CHAN SIP Device -> Submit
Create an extension number. Suggested: use three digits, start at 101. If you have a favorite number, use that.
Under "User Manager Settings" are the settings you will use to log into the User Control Panel (UCP).
If you enable voicemail and enter an email address, you can have voicemails emailed to you as an attachment.
You must click on the APPLY CHANGES button at the top do to so.
How to get a free US Phone Number
Go to IPKall. Give them an email address. You SIP URI is: [EXTENSTION]@time.pumpingstationone.org
For example: email@example.com
It should work. Needs more testing.
How to use WebRTC
You need to be on-site or use the Vpn.
Log in to the User Control Panel using the username and password you created with your extension.
Click the phone icon in the upper right and select "New Web Phone Call"
Dial the extension. For the talking clock, dial *60