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	VPIM Directory Architecture | Historical EMA Proposal Internet Telephony Directory

VPIM Directory Architecture

VPIM Directory Components Following components illustrate how directories can be used in voice messaging systems (VMS) : A — Voice Messaging Directory Client VMS with LDAP Access B — Voice Messaging Directory Client & Server VMS with LDAP Access and X.500 capabilities Holds data for its own subscribers C — Voice Messaging Directory Service Provider LDAP Access and X.500 capabilities Shares the VPIM address mapping sub-tree Can hold subscriber data for other organizations X — Indirect Access Client VMS with no Directory client Relays all out-going SMTP voice messages to an SMTP host with mapping capabilities ('Y's) Y — Indirect Access Service Provider Provides address mapping for 'X' components Direct Mapping 'A' and 'B' components are VMSs which use LDAP for mapping from telephone number to SMTP address before sending a message. Indirect Mapping 'X' components do not directly support LDAP and must rely on 'Y' components to perform the required address mapping. 'X' components send all out-going SMTP voice messages to a 'Y' host. Outgoing SMTP messages from 'X' are addressed (i.e., local-part@domain-part) with the telephone number of the intended recipient in the local-part. The domain-part identifies an SMTP 'Y' host. When a 'Y' component receives a message from an 'X' component, it uses LDAP to map from telephone to SMTP address. The 'Y' component then resubmits the message using the new address.  Abbreviations DISP — Directory Information Shadowing Protocol (X.500 Server-Server Replication Protocol) DSA — Directory Service Agent (X.500 Directory Server) DSP — Directory Service Protocol (X.500 Server-Server Protocol) LDAP — Light-Weight Directory Access Protocol (Internet Directory Access Protocol) SMTP — Simple Mail Transfer Protocol (Internet Messaging Protocol) VMS — Voice Messaging System VPIM — Voice Profile for Internet Mail  For more information about this page, please contact Anne (Philpott) Brown, Nortel Technologies, 613-765-5274, arbrown@nortelnetworks.com   Back to top