If the calling phone is associated with a Calling Search Space (CSS), and the route pattern that matches the called number is in a partition, ensure that the partition of the route pattern is listed under the calling phone's CSS.
If the calling phone is associated with a CSS, but the router pattern that matches the called number is not in a partition, reset the CSSand the calling phone. If the failure persists, refer to Setting up Cisco CallManager Traces for the TAC and present them to Cisco Technical Support Website for further diagnosis.
If the calling phone is not associated with any CSS, ensure the route pattern that matches the called number is in a partition. If it does, either remove the partition information from the route pattern, or add the partition to a CSS of the calling phone (based on your class of service policies).
If no CSS or partitions are used, reset the calling phone to ensure the Distinguished Name (DN) is updated in Structured Query Language (SQL) database.