From: =?utf-8?q?I=C3=B1aki_Baz_Castillo?= <[EMAIL PROTECTED]>

   For this case, IMHO "tel" URI is perfect. An user visiting a web
   could click into a link like:

   Of course, for this to work the softphone needs to have set an
   outbound proxy, if not the softphone can't send the request.

A softphone could use any of a number of strategies for handling a
"tel:" URI:  (1) send to a configured outbound proxy, (2) translate
through ENUM (using the official DNS tree or other trees), or even (3)
use the computer's modem interface to dial a PSTN line.  The nice
thing about "tel" is that it declares the address and leaves it up to
the executing device to determine the strategy for reaching that
address.

Dale
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