When switches are networked together using ISDN QSIG tie trunks or ISDN tie trunks, in some call scenarios Communication Manager sends extension numbers from the networked switch to the AE Server. The format of these extension numbers may be different than the format of local extension numbers.

If the networked switch has a different extension length than the local switch, extensions might be reported with both the local extension length and the networked extension length. Be sure to administer To TelURI rules that can successfully convert both extension lengths for the networked switch.

Also, you might need multiple entries in the To TelURI rules for the networked switch if that switch has a different extension length than the local switch.