how do I stop phone calls [closed]

asked 2018-12-01 18:40:02 +0000

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I run a small business and get random phone calls (not through my cloud switch). I need to find the source and block them.

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Closed for the following reason question is off-topic or not relevant by grahamb
close date 2018-12-01 20:52:27.240159


If it isn't happening over a network on which Wireshark can capture traffic, Wireshark can't help, so this is not the best place to ask that question. If it's coming over an ordinary landline, you're probably out of luck, and should talk to the phone company.

Guy Harris gravatar imageGuy Harris ( 2018-12-01 21:43:24 +0000 )edit

If you mean that these calls arrive directly to your SIP phones, either configure the phones to only accept calls coming from the cloud switch or, if not possible, use a firewall to prevent SIP packets from anywhere else than the cloud switch from reaching the phone(s). In this case, a whitelist is more efficient than finding the source as the source may (and probably does) change over time as the spammers use botnet zombies as proxies. So if using a blacklist, you'd have to continuously monitor the network and still get spammed now and then.

sindy gravatar imagesindy ( 2018-12-09 17:01:39 +0000 )edit