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+Asterisk SMDI (Simple Message Desk Interface) integration
+---------------------------------------------------------
+
+SMDI integration is configured in smdi.conf, zaptel.conf, and voicemail.conf.
+Various characteristics of the SMDI interfaces to be used (serial ports) are
+defined in smdi.conf. SMDI integration for callerid and MWI are defined in
+zaptel.conf and voicemail.conf respectively. SMDI only works with Zaptel
+interfaces configured for FXS signalling.
+
+When SMDI is enabled and a call comes into Asterisk, the forwarding station
+number is used as the destination for the call and any callerid information
+present is used. This way you can configure your extensions.conf as follows to
+behave as a message desk.
+
+[default]
+
+exten => _XXXXXXX,1,VoiceMail(${EXTEN}|${SMDI_VM_TYPE})
+exten => _XXXXXXX,n,Hangup
+
+exten => s,1,VoiceMailMain(${CALLERID(num)})
+exten => s,n,Hangup
+
+The ${SMDI_VM_TYPE} variable will be set to u, b, or nothing depending on the
+contents of the type of SMDI message received.
+