Updates to Chapter 8
The HTML 4.0 Sourcebook

Callto URLs (Internet Explorer 4 only)

Internet Explorer 4 supports callto URLs. These URLs are used to reference a link to an Internet call using the Microsoft NetMeeting software and protocol. The general form is

callto:server.domain.edu:port/e-mail-address

where server.domain.edu:port is the server at which you wisht oontact the user (the port can, in general, be left off -- I do not know the default value) and e-mail-address is the address of the person you wish to contact. An example link is:

<A HREF="callto:uls.microsoft.com/cgray@mydomain.com">
    uls.microsoft.com/cgray@mydomain.com</A>

Which is rendered as:
    uls.microsoft.com/cgray@mydomain.com

This URL for is not understood by Netscape Navigator.