No caller ID (CID) names showing up on phones? Run the usual debug isdn q931 and debug isdn q921 to make sure that the CID name is coming from the provider. If it is, add isdn supp-service name calling to the serial port for the ISDN trunk. Then retest.
Source: https://supportforums.cisco.com/docs/DOC-8873
Example:
interface Serial0/3/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn incoming-voice voice
isdn map address . plan unknown type unknown
isdn supp-service name calling
isdn sending-complete
isdn outgoing ie redirecting-number
trunk-group ALL_T1E1
no cdp enable
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