Here is the information for the U.S.
Sending a voice message (Voice Broadcast)
This costs 2 credits per minutes plus machine detection if used. The cost of machine detection is an additional flat rate of 0.5 credits per number called.
An alternative to machine detection is to turn on the call screening greeting. While this option is free, it DOES add additional seconds to the call, so that might bump your call price into the next minute and double the credit cost. Check out the full discussion here.
Incoming calls - live answered
These cost 2 credits per minute because you are not using the call forwarding feature.
Incoming calls - call forwarding
When you are using the call forwarding feature, incoming calls cost 3 credits per minute.
***It is 1 credit more IF the caller left a voicemail recording - fixed charge per voicemail.
***It costs 4 credits more to transcribe the voicemail to text - fixed charge per voicemail.
Outgoing calls
The cost is 2 credits per minute.
The costs shown above are estimates.
It could be more, but it could also be less. Make sure you have enough credits to cover you if the cost does go up into the next rate.
If you are looking for directions on how to send a voice broadcast: