更多的端口使手机系统更脆弱吗？
this depends on the security measures in place on the ports. more ports mean that you have to employ more voip security measures when protecting your voip system. for this reason, your team needs to use the minimum number of ports so that there are fewer entry points into your voip network to protect. it’s also essential to plan implementation before you install any new voip infrastructure.
in theory, no  though of course, they may get suspicious when you stop answering or returning their calls or if they can’t reach you.   
the caller won’t receive any sort of notification that their number has been blocked. 
instead, they will hear/receive messages saying that the number is no longer in service or that the text message couldn’t be delivered. 
一旦您阻止了一个来电者，他们将无法再与您联系，反之亦然，直到您取消阻止电话号码。