Whatsapp voice app

My sales colleagues receive lately a lot of whatsapp voice calls from customers on their mobile devices connected to our office wifi network. Till now we are blocking port 5223 which seems to block this and other voice apps. Is it safe to open our firewall? Are there any known security risks?
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Having port 5223 to work in a normal way poses no security risks. I assume you didn't literally mean open your firewall, because that defeats the whole purpose of a firewall. Just set it up default to allow nothing in. But since port 5223 is initiated by the phone itself, it poses no extra risks. You blocked the outgoing 5223 traffic, and thereby all PUSH notifications. I'd guess it's pretty annoying for the users. Just block the whatsapp calls one by one. (or did you mean, the sales dept actually want to have those calls, except management/IT doesn't want it?)
joosgilopsAuthor Commented:
yes, of course I only wanted to open 5223 for outgoing traffic. Not sure that I understand your last sentence.
Hi joosgilops

Dat link will explain you all the risk when you open your fire wall :

Opening port 5223 for outgoing traffic provides no additional risks.

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