AT&T MERLIN LEGEND System Reference Manual page 395

Features
Coverage
Forced Account Code
Entry
Forward and Follow Me
Group Calling
Last Number Dial
Multi-Function Module
Paging
Park
Pickup
Pools
Power Failure Transfer
2-346 Station Message Detail Recording
The extension of the telephone on which an Individual or Group Coverage call is
answered is shown on the SMDR report.
The account code is printed in the "Account" field of the SMDR record.
If the system is programmed to track both incoming and outgoing calls, two
SMDR records are generated when an outside call is forwarded to an outside
telephone number. One record shows the incoming call, and the other record
shows the call made to the destination telephone number with the forwarding
telephone as the originator.
Calls to calling groups are associated with the first extension to handle the call.
If the call is answered by the calling group delay announcement, the extension
for the delay announcement device is recorded on the SMDR record even if the
call is transferred to a calling group member or to an overflow group. The timing
begins as soon as the calling group member or delay announcement answers
the call. If the caller hangs up while listening to a delay announcement, the call
is associated with the extension of the answering device.
All numbers dialed on an outside call by using Last Number Dial are recorded
on the SMDR report.
An MFM is treated as an MLX telephone on SMDR reports. The system waits
until the end of dialing before sending a connect message to the MFM. Any
digits dialed after the connect message is received are not recorded on SMDR
reports.
Paging calls are not reported to SMDR.
If an incoming call is parked but is not picked up by the other extension, the
extension of the user who activated Park is shown in the "Station Extension" field
of the SMDR record for the call. If an incoming call is parked and picked up by
the destination extension, the destination extension is shown in the "Station
Extension" field of the SMDR report.
The extension of the user picking up the call via Pickup is shown on the SMDR
report.
For outgoing calls made by using a pool, the trunk selected by the system is
reported on the SMDR report.
During a commercial power failure, all calls are disconnected and no SMDR
records are generated for these calls.