Hack to use Jajah Direct in Countries without access number via Grand Central

Jajah announced that users of Jajah Direct can enjoy 60 minutes free VoIP call during Xmas. But Jajah Direct only has access numbers in US, Italy, Germany, UK, Austria and Israel, which means users in other countries cannot benefit from this offer.

The hack below will introduce how to use Jajah Direct via GrandCentral in countries without access number.
First, register a GrandCentral number and a Jajah account. Then add the GrandCentral virtual number as a registered phone into Jajah account. After that, choose the virtual number as Callser ID in GrandCentral setting, because Jajah Direct identifies users via Callder ID.

Second, add the Jajah Direct access number as into GrandCentral contacts list. But when I was using GrandCentral to call this access number, the voice promot said the Caller ID cannot be identified and required credit card information. However, now in you Jajah account information, you can find virtual numbers corresponding to each contact. Add this virtual number to contacts list of GrandCentral and call it, then it will be connected.
Run VoIPBusterPro binding with GrandCentral virtual number and dial the Jajah Direct virtual number, your call will be connected.

The reason to use GrandCentral is that the virutal number from GrandCentral can be used as Caller ID and it provides free callback VoIP calls within US