Protocol

The signals exchanged between the messaging system and MX-ONE Service Node consist of the following parts:

• STX

  Start of text character.

• NNNNN

  A 2 to 5-digit directory number in the PBX.

• SS

  A 2-digit messaging system number defines in which system there is a message waiting for the extension.

  Each messaging system has its own, unique, system identity.

  02-99 = identity of the messaging system

• CR

  Carriage Return character

• LF

  Line Feed character

Via command it is possible to select whether data flow checks shall be/shall not be used. (XON/XOFF-protocol).

The messaging system shall be capable of accepting the following messages, which are sent from the MX-ONE Service Node:

• STX 54 CR LF

  The PBX requests an update from the messaging system, i.e. indicate message waiting, for relevant extensions.

• STX 70 NNNNN SS CR LF

  Acknowledgment of message waiting indication from extension NNNNN and message system SS. The signal is sent only if the function has been chosen by entering the ICMWC command.

• STX 99 CR LF

  Heartbeat response

  The heartbeat response is sent from the PBX in response to heartbeat check signal.

The PBX can accept the following signals from the messaging system:

• STX 02 CR LF

  An acknowledgment to STX 54 CR LF means that the messaging system is ready to update the message waiting information of the MX-ONE Service Node by sending a number of STX 06 for the extensions concerned. STX 02 can also be accepted spontaneously if the messaging system requests an update.

• STX 03 CR LF

  Updating completed (see STX 02).

• STX 06 NNNNN SS CR LF

  Indicate that extension NNNNN has a message waiting for him in message system SS.

• STX 07 NNNNN SS CR LF

  Erase the message waiting indication for extension NNNNN and system SS.

• STX 98 CR LF

  Heartbeat check.

  The heartbeat check is sent periodically from the messaging system.