International conference call provider - any good? (Jakarta)

Hello - our company uses an international conference call service (you call a local number, type some digits to get into a specific session and you talk to your colleagues from London and Russia, everyone pays local telco prices). The problem is that the Indonesian number I found out accepts only incoming *landline* calls.

I am looking for an alternative, preferably that can be paid (pre-paid) by credit card where I can call locally with an Indonesian mobile. service you guys work with?

AnyThanks!