I have not tried it, but have read that Vbuzzer will work in U.A.E. because Vbuzzer runs their proxy on port 80. To read more about that you can do a google search for the following terms.
vbuzzer port-80 uae
Although the VoIP service provider chooses the port for their end, you have to choose the port on your end. Obviously you should not use the standard SIP port, 5060 if you wish to avoid the blocked ports.
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