How to Block Calls that show as "Unavailable"

[Univ. of North Florida]

Hi,

We are receiving many calls from different numbers and IP's that show a caller name field of "Unavailable". These calls do not appear the same as "anonymous" calls do either. I will provide screenshots below showing the difference. We have used many different CID Blacklist rules to try and stop these calls; however, none of them work to stop the calls. Some of these rules include entries to block "unavailable", "Unavailable", and "*navailable".

I believe these rules don't work to block the caller ID because the text unavailable doesn't appear where the normal number would actually appear as it does with "anonymous" calls. Instead it appears outside of the number and the number still appears. The screenshots below should clarify the difference we're seeing in how these "Unavailable" calls come through. Please let me know how we can block these kinds of calls as normal CID Blacklist rules don't seem the do the trick.

Normal Call:

Unavailable Call:

Anynoymous Call:


Thank you and let me know if y'all need anymore information.

Anthony Howell
University of North Florida
Network Engineer I

 

[Charles_3CX]

The rules within 3cx apply to the Caller's ID and not the Display Name; this is the part highlighted below in the From user Part of the SIP invite header.



So when creating the CID blacklist rules, you need to use the incoming Caller ID

For example

 

[Univ. of North Florida]

Hi Charles,

I figured that was the case so I appreciate you confirming that for me and letting me know what those fields are called. Is there any way to block calls based on the text that says "Unavailable" in the Display Name field?

We get multiple calls that say Unavailable from many different numbers not just this one. The IP's differ I believe as well, so I can't just block based on the IP either.

Thank you,

Anthony Howell

 

[VoIPTools]

You can do it with a Call Flow Designer application.

 

[Univ. of North Florida]

I'll look into doing this via the CFD application. Any guides or other forums you know of that we can follow to do this?