I tried a sipgate.co.uk account today and it registered in my Voxalot account (logged onto us.voxalot.com).
I could receive calls from another sipgate.co.uk account.
I could not reach the account from a non-sipgate.co.uk account.
I do not have a sipgate.de account, so I cannot test it.
In all fairness, if sipgate.de does not register with Voxalot, one should ask Sipgate why they are blocking Voxalot, because it is their SIP server that is doing the block.
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