callerid displays as " unknown"

[susim]

Hi All

Sometimes  callerid displays  as " unknown"  or  " router ip"  " or call manager ip "

Why does it happenes

Please help

Thank you for your supports

[kelvin.blair]

Can you provide us a little more detail to your setup?

CUCM or CME?

What Version?

How are your gateways setup?  H323 or MGCP

What is your PSTN connectivity?  POTS, PRI, SIP

Thanks!