
Originally Posted by
VOIPoTim
There's an option in the Grandstream to only accept SIP calls from the server you're connected to.
I'm not 100% sure (I don't get into the tech side of things) but I don't see any reason this couldn't be enabled based on my knowledge.
Open a ticket and ask for Tier II and this can be enabled for you to see if it resolves your issue.
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