Have you had a look on 'myTello' ?
Here you find our rates to more than 227 countries. Top rate ✓ best calling quality ✓ free start credit & free trial call ✓
www.mytello.com
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I haven't used 'mytello' personally, but I have used similar services in the past to make international call from different countries to ID.
Example of Call rate per minute to Landline
from ID to Europe DE, UK, FR, Es, etc : Rp163
from ID to US : Rp163
from ID to AU: Rp 278
rounded at 700 Rp per call.
Some may question the need for services like 'Skype' or 'Mytello', etc when WhatsApp call is widely available. However, if you need to call government offices or banks for customer support from abroad, you will likely have to dial a landline, as they may not support WhatsApp calls.