154 ConfigurationIn this figure, the CS 1000 has a HLOC of 354 and an LOC dialing planentry of 344. The LOC dialing plan 344 is not dialable, however, calls to theDN: 6712 extend the call to the number 6-344-5000. By PCA extending thecall to 6-344-5000, a SIP Invite is sent to the OCS Proxy server.The OCS Proxy server runs MCM, which handles the Invite and reads theOriginal Called Number as 354-6712. The call is sent to the Mediationserver and To and RequestURI are mapped to the Line URI. In this diagramthe user is mccarthy@ocs2007a.corp.nortel.comThe purpose of configuring is to ensure that the Office Communicator hasthe same phone number for both incoming and outgoing calls.For more information about Dialing Plans, see IP Peer NetworkingInstallation and Commissioning (NN43001-313).Configuring the Personal Call AssistantPersonal Call Assistant (PCA) is used to "twin" incoming calls so users cananswer the calls on either their desktop phone or Office Communicator 2007.For incoming calls to be extended to the "twinned" Office Communicatorclient, a PCA Terminal Number (TN) must be defined for that DN. A newPCAM Class of Service prompt has been introduced so a distinctionis made between PCA associated with the OCS 2007 client and PCAassociated with other types of clients. Class is configured using BCC. Formore information on BCC, see Basic Client Configuration. PCA associatedwith the OCS 2007 client, the class is set to PCAM. Other types of clientsuse the default class PCAG. During call processing, the class is checked todetermine whether an incoming call should be extended to the PCA targetDN or not. For more information about configuring PCA, see Features andServices (NN43001-106).The PCA TN is configured to send the call to another number. In the case of"twinning" to Office Communicator, the call is sent to a number that is notdialable but routes the invite to the Office Communications Server. For moreinformation, see Configuring the Dialing Plan to route to MCM.ATTENTIONIMPORTANT!If SIP CTI control is also enabled for that telephone, the PCA TN cannot beMARP 0.Nortel Communication Server 1000Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007NN43001-121 01.03 StandardRelease 5.0 30 April 2008Copyright © 2005–2008, Nortel Networks.
