Try dialing 500# to access voicemail.
The problem is probably caused by the Call features native to the Grandstream device.
You can turn this off if you want, and then *600, *500 will work.
There may also be a conflict with some Sipbroker access numbers if the call features are left enabled.
You can use a workaround in the Voxalot dial plan, but then you always need to dial an alternate string instead of the[*] and use the dial plan to replace with[*].
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