Unavailable numbers on voip phone -3CX


We are using voip phone and provider is 3CX . Currently we are receiving a lot of phones call with unavailable number. 3rd party support is saying that everything is ok from their side. When we ask customer if they are ringing from withheld number , most of them say that they are not ringing from withheld number. Please advice what could be wrong
sadiya yousafAsked:
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nociSoftware EngineerCommented:
Step 1:  you can tap the wire (f.e. using wireshark , or other packet capture tool) and record a session to tell IF there is a number mentioned in CALL packet.

If there is no number there or a 0.. then there is no number. presented to the phone. If there is a number there then the phone is not presenting it.

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sadiya yousafAuthor Commented:
I have asked third party for packet filtering , it was right move as soon as I spoke the term , the guy said that it was going to be our next move even though in the previous call he had kind of closed the call
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