Unavailable numbers on voip phone -3CX

Hi

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:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Voice Over IP

From novice to tech pro — start learning today.