![]() Telco can provide this feature if they are controling your caller ID, but if you are in control, that's where the problem lies. I am experiencing the same issue when calling AT&T cell phones over Windstream. RE: Caller ID issues showing "uknown" to mobile phones montyzummer (IS/IT-Management) 27 Feb 15 16:49 If anyone of these 3 parameters are incorrect or not populated then this can cause the reported trouble of “unknown” caller ID to cells. ![]() Screening indicator: Reserved for ‘User Provided, Passed Network Screening’ Numbering plan indicator: ISDN (Telephony) numbering plan (Recommendation E.164) Nature of address indicator ANSI: Unique national (significant) number It may work sometimes w/o these parameters but the only way to GUARENTEE CID# delivery to cells is if the PBX has these 3 parameters populated. The PBX needs to ensure it is populating 3 calling parameters in order for caller ID# to be delivered to these cell carriers. This is ALWAYS a PBX issue and should never be referred out to carriers. CSR reports caller ID to ATT or VZ cells showing “unknown” (with no number). This is a very common caller ID ticket you will see. You will need to engage your phone equipment vendor to resolve this issue. I have provided you more information below. We have learned that ATT,Verizon and Level 3 and require specific messaging for caller ID to show correctly for caller ID. Check out this message from carrier support:
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