by Olivier | Mar 7, 2010 | CUC, Non classé, Uncategorized, Written Theory |
The digital PBX Adapter (DPA) voice mail gateways are designed to allow integration of Octel voice mail solutions with Call Manager. DPA uses SCCP to communicate with the Call Manager. It converst DTMF tones to SCCP to enable the communication between the Octel voice mail system and Call Manager.
The DPA will appear on the Call Manager as a collection of 24 IP Phones and the 25th is used to transmit MWI commands. DPA voice mail gateways communicate then with the PBX and Octel voice mail system using the 24 stations lines configured.
Note that there are two other alternative methods of integrating Call Manager with the Octel solutions ( or SMDI solutions):
- Using a direct SMDI connection between Call Manager (uses of the COM port) and the voice mail system with analog FXS/T1 CAS E&M ports gateway (WS-X6624, VG224). On the Call Manager, the CMI service intercept calls forwarded to voice mail and sends then SMDI messages on the COM port to the voice mail system.
- Using a VG248, and in that case , the Call Manager connects to the VG248 using SCCP. So the VG248 connects diretly to the voice mail system using an async port for SMDI and analog FXS ports.
by Olivier | Mar 6, 2010 | CUC, Non classé, Uncategorized, Written Theory |
SMDI error messages are sent using the following format:
<CR><LF>MWI “stn-num”!<0X20>”error-code”<CR><LF><^Y>
The error code will be one of the following
- INV : Indicates that the station number is invalid
- BLK : Indicates a block condition
by Olivier | Mar 6, 2010 | CUC, Non classé, Uncategorized, Written Theory |
Here are the format of SMDI messages used with MWI On/Off :
MWI On
OP:MWI<0X20>”stn-num”!<^D>
OP is used to indicate that MWI should be turned on for the specified station number and <^D> indicates an end of transmission.
MWI Off
RMV:MWI<0X20>”stn-number”!<^D>
RMV is used to request that MWI should be turned off the the specific station number
by Olivier | Mar 6, 2010 | CUC, Non classé, Uncategorized, Written Theory |
As expalined in the previous post, SMDI messages are a set of ASCII characters and symbols so we can easily understand the structure of the messages.
Direct Calls
<CR><LF> MD “md-num” “md-port” “fwd-type”<0X20>”src-num”<0x20><CR><LF><^Y>
Here is the explanations of all elements
- <CR> : Carriage Return
- <LF> : A Line Feed
- MD “md-num” “md-port” : Message Desk Number (usually 001) and Message Desk Port (a port between 0000 and 9999)
- Forward-type : Indicates the forwarding type, D is a direct call
- <0X20> : ASCII space
- “src-num” : the number of the station from which the call originated (ANI)
- <^Y> : Control Y
Forwarded Calls
<CR><LF> MD “md-sum” “md-ports” “fwd-type” “fwd-station”<0X20>”src-num”<0X20><LF><^Y>
So the new fields are
- “fwd-type” : As previously mentionned, this indicates the forward type but in this case, the type can be A (All cals), B ( Busy), N (No-Answer) or U (forwarded for unknown reason)
- “fwd-station” : The RDNIS (original called party number)
by Olivier | Mar 6, 2010 | CUC, Non classé, Uncategorized, Written Theory |
SMDI can be used over RS-232 to connect a PBX to a voice mail system. SMDI is an out-of-band signaling which necessitates voice and signaling information being carried on separate paths.
The integration is possible via RS-232 connection because it transports the Automatic Number Identification (ANI) and the Redirecting Dialed Number Identification Service (RDNIS) which are used to indicate the calling party number and the original intended receipent respectively.
SMDI is used to transmit information about call types, reason of forwards, about MWI On/Off states and about error states. SMDI messages are comprised of ASCII characters and symbols.
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