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Voice Processing Features
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
AMIS Networking
B. AMIS NETWORKING
2.15 Audio Messaging Interchange Specification (AMIS) is a vendor-independent protocol
for networking Voice Mail systems. The Voice Processing Unit supports AMIS-Analog which
uses DTMF control signaling and analog message transmission.
2.16 Voice Processing uses Call Routing Announcement applications (local or off-node) to
detect and process incoming AMIS calls. The Call Routing Application’s greeting must consist
of only a 15-second pause (one long and one intermediate pause), because AMIS disconnects if
it detects voice.
2.17 AMIS-Analog uses DTMF signaling to exchange control information between the orig-
inating system and destination system. Voice Mail messages are transmitted in analog form
over the public telephone network. This means that the originating system uses its standard
playback function to transmit, and the destination system uses its standard record function to
receive. Because messages are transmitted in this manner, message transmission time is exactly
the length of the message plus synchronization and control signaling overhead (which is typi-
cally less than one minute).
2.18 AMIS-Analog specifies that the destination system terminates the call if it detects a
period of silence of ten seconds or more during message transmission. Therefore, messages
being transmitted should not contain periods of silence that are longer than ten seconds. They
should also not contain any DTMF tones or call progress tones that may cause the destination
system to disconnect or stop recording prematurely.
AMIS Call Processing
2.19 An AMIS call is initiated by the originating system calling the destination system over
the public telephone network. When the call is connected, the originating system and destina-
tion system perform a handshake to establish the AMIS session.
2.20 The originating system then identifies itself with its system number and AMIS protocol
version. After acknowledgment by the destination system, the originating system specifies the
type of message to be delivered, the length of the message (if available), the originator’s mail-
box number, and the recipient’s mailbox number. The originating system then begins transmit-
ting the previously recorded message by using its standard playback function. The destination
system records the message and delivers it to the recipient’s mailbox.
2.21 Outgoing AMIS calls are made by the Message Notification/Retrieval application.
When a network mailbox that is set up for AMIS networking receives a message, it triggers the
Voice Processing Unit to make an outgoing AMIS call to deliver the message.
2.22 The Voice Processing Unit begins by calling the System Number of the remote node. If
the remote number is busy or there is no answer, the Voice Processing Unit continues attempt-
ing to contact the remote node until the remote node answers, or until it has made the Maxi-
mum Network Call Attempts. If the Voice Processing Unit has made consecutive, unsuccessful
Maximum Network Call Attempts (due to busy or no answer), it stops attempting to contact
the remote node and returns any messages pending for the node.
2.23 If the remote node answers the call, the Voice Processing Unit establishes the AMIS
session with the remote node. After a successful handshake, the Voice Processing Unit starts
the AMIS session. (If this is unsuccessful, it disconnects and tries again.) If the destination sys-
tem successfully acknowledges the AMIS session, the message transmission process starts.
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