Code from Minimo could be used as a basis for the XPCOM component:
http://mxr.mozilla.org/mozilla1.8/source/minimo/components/phone/
Once this code is ported and tested, nsTelProtocolHandler should be updated to make use of this new XPCOM component.
== Project News ==
This is where your regular updates will go. In these you should discuss the status or your work, your interactions with other members of the community (e.g., Seneca and Mozilla), problems you have encountered, etc.
Put detailed technical information into the Project Details page (i.e., update it as you go), and save this section for news about participation in the project.