Hi,

 > They do have a lot of differences but not in dbus method layer. For
> example,
> ofono_voicecall_driver has methods like dial, answer, hangup all,
> hold_all_active...etc,
> I believe cdma will have almost same methods like GSM. When we are using
> them in
> application layer, we will call the same method name but different kind
> of modem driver.
> I am wondering why ofono created two different interface name and provide
> the same call method?

The basics are the same, sure.  However, once you get into the details 
of three way calls, call waiting, multiparty calls, etc the logic and 
API becomes vastly different.

Not to mention the various differences between carriers and their 
specific extensions.

Bottom line is, compared to insanity of GSM/UMTS, CDMA is even more of a 
mess and the API needs to evolve on its own.  In the future, if it makes 
sense to unify them, then we can do so.  That time is not now.

Regards,
-Denis