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Các tiêu chuẩn Amis nổi lên từ một nhóm các nhà cung cấp hộp thư thoại và người sử dụng hệ thống ban đầu gặp nhau vào năm 1988 để xác định một tiêu chuẩn duy nhất cho khả năng tương tác. Thực tế, có hai giao thức Amis riêng biệt quy định: | Migrating Your Network to AVVID Technologies Chapter 3 93 Figure 3.3 Voice Mail Integration Using SMDI Voice Mail Integration using SMDI in a Legacy System Telephone The AMIS standard emerged from a group of voice mail vendors and system users that initially met in 1988 to define a single standard for interoperability. There are actually two separate AMIS protocols defined AMIS-A analog and AMIS-D digital . The formal standard was issued in February of 1990. Prior to AMIS there was no way for messaging systems from different vendors to exchange messages. Using AMIS multiple messaging systems located in the same building on the same campus in different cities or even in different countries can be interconnected via the PSTN. A voice mail www.syngress.com 94 Chapter 3 Migrating Your Network to AVVID Technologies system that needs to send a message to another simply places a phone call to the receiving system and passes the message as analog voice data. DTMF tones can be used by the sending system to indicate the recipient s mailbox. AMIS is a relatively easy method of networking VM systems because it simply requires analog voice facilities. As a result it is has become widely supported by most legacy voice mail system vendors. Voice Profile for Internet Mail VPIM VPIM is an international standard for transferring voice and fax messages between different voice mail systems using standard e-mail systems within an intranet or the public Internet. It is based on the Internet e-mail standards Simple Mail Transfer Protocol SMTP and Multipurpose Internet Mail Extensions MIME . Different voice mail systems can exchange messages if they can send and receive e-mail with audio attachments. VPIM can be used in an AVVID network for integrating a voice messaging VM or unified messaging UM server with a legacy voice mail system or for networking multiple VM UM servers together as a single system. VPIM was developed by a consortium of messaging vendors including AVT Centigram Lucent