AT&T MERLIN LEGEND Release 4.0 Feature Reference page 340

Feature Reference
SMDR
Speed Dial
System
Access/Intercom
Button
Transfer
340
Last Number Dial
All outside numbers dialed using Last Number Dial are recorded on the
SMDR report.
Telephone numbers dialed using Personal Speed Dial are stored by
Last Number Dial. However, if the number includes special characters
such as Pause or Stop, the special characters do not work when the
number is redialed using Last Number Dial. Telephone numbers dialed
using System Speed Dial are not stored by Last Number Dial.
When Last Number Dial is used on a call made with a Shared SA
button, the number is stored on the extension where Last Number Dial
was used, not on the principal extension.
Last Number Dial can be used to dial the outside number of the
telephone to which the call is being transferred.