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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.
To optimize the experience of Microsoft Office Communicator users and Microsoft Lync users, be sure to administer "To TelURI" rules for the networked switch, or switches, as well as the local switch. Additionally, 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.