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Yealink Forums » IP Phone Series » General topics » Ghost Calls from Port Scanning

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Ghost Calls from Port Scanning
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Bryan Nelson Offline
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Posts: 71
Joined: Feb 2013
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Post: #22
RE: Ghost Calls from Port Scanning
Our service supports using TCP as the SIP transport. Adds some latency, but it can be useful for situations like this, better battery life on mobile, bypassing SIP-ALG on verizon 4G hotspots, etc...

It does use more resources on the server however.
Edit: I just tested the "Allow IP Call" = No and I am no longer able to make an unsolicited call to the extension.

Looks like newer firmware versions may have fixed this since I last tried. I will test more, and update here with results. Looks like the sip trust control is not required to kill generic sip vicious scanner calls. A more advanced scann attack might still be able to gather the extension, but I'll cross that bridge when it happens...
(This post was last modified: 12-04-2014 07:55 AM by Bryan Nelson.)
12-04-2014 07:34 AM
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Messages In This Thread
Ghost Calls from Port Scanning - ctiefel - 11-08-2013, 10:01 PM
RE: Ghost Calls from Port Scanning - Fuur - 11-25-2014, 07:01 PM
RE: Ghost Calls from Port Scanning - Bryan Nelson - 12-04-2014 07:34 AM

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