URL Scheme for Phone Call

Question

Much like the \"mailto\" URL prefix launches the user\'s default mail program and starts a new email with specified address, is there a similar URL scheme that would initiat

Answer 1

I'm after the same sort of functionality for Microsoft Office Communicator. After a bit of investigation I found that the following URI syntax will initiate a (VoIP) phone call via communicator:

tel:+number

eg: to get communicator to call my extension:

tel:+7780

Answer 2

The official standard for providing a telephone number as a URI is here: http://www.ietf.org/rfc/rfc3966.txt

It basically says use tel: as the prefix, and start the number with +[international dialling code] before the number itself. You can put non-numeric characters as separators (e.g. -) but they must be ignored. So a London (UK) number might be:

tel:+44-20-8123-4567

A New York (US) number:

tel:+1-212-555-1234

Answer 3

sip: (or sips:) is the official URI scheme for SIP, and I think callto: was used by Skype, but is deprecated.

Answer 4

There is such a URI scheme: tel. It has an elaborate syntax, but here is a simple example of its usage:

tel:123-4567

For the full specification, refer to http://www.ietf.org/rfc/rfc3966.txt .