PLDT has launched ID-DSL: International Dialing for DSL Subscribers. Details. The calls may be placed through the PC (“VoicePad”), or through the handset.
For the latter, I believe there is technically no need for a DSL subscription since the call will be handled by a voice gateway on the PSTN. PLDT probably wants to limit it to DSL/data subscribers so that they won’t be offering VoIP to the “public” yet. They also lock the ID-DSL subscriber to one a year contract, which can’t be done to casual IDD long distance users.