Mitel SX-200 Practices page 255

Features
When all DTRX channels are busy, callers queue for DTRXservice. Up to 28
callers can queue, including those queued for destinations. Subsequent
callers are prompted to try again later.
Conditions
The following conditions apply to this feature:
A dataset connects each Data Terminal (DTE) to the system on a DNIC
circuit.
The DTE connected to the dataset must be an ASCII data device using
an RS-232C interface.
All DTRX commands (except ACCOUNT) may be abbreviated to its
minimum unique character string.
To connect to a Data Transceiver, a data device must have a DTE Pro-
file number programmed in CDE Form 12 (Data Assignment).
Programming
The DTRX feature is associated with the DTE Profile and Data Circuit
Descriptor options. Refer to CDE Form 29 (DTE Profile) and CDE Form
71 (Data Circuit Descriptor Options).
Enable or disable COS Option 900 (Data Station Queuing) as desired. This
option, when enabled, allows automatic queuing to the destination when the
originator encounters a busy data device.
Enable or disable COS Option 901 (DTRX Herald Display) as desired. When
enabled, this option allows display of the programmable herald(e.g.
Welcome to MITEL Data Switching).
If DTRX Herald Display is enabled, set COS Option 905 (DTRX Herald Text
Select) to 1,2, 3, or 4. The options are as follows:
[I] Welcome to MITEL SX-200 DIGITAL Data Switching
[2] Welcome to MITEL Data Switching
[3] Welcome to Data Switching
[4]
Data Call Switching
Enable or disable COS Option 902 (DTRX Message Code) as desired.
Enabling this option displays the machine message code. The code is
divided into three segments:
the first character describes the application; either " G " for general mes-
sages, or " D " for DTRX application messages
the next two digits identify the message category
the last two digits identify the message
for example, DO1 02, where:
D = DTRX application
01 = Information
02 = Connected