This occurs on my office phones. We use a system called RingCentral and when people call our office lines from a VZW phone, they often get a message that this number is not in service or silence with no ringtone. This does not happen with other branded cell phone companies. I do not know who to call about this and would like some direction. Same thing is happening to us as what is happening in this thread:
Re: Can't call certain numbers from VZW. No issues from other networks.
I have tried the few fixes in the thread and none worked, so I am worried the only fix will be from VZW side. Any help would be appreciated!