NEC DSX 1093099 - Manual (Page 167)

Tandem Calls / Unsupervised Conference
DSX Feature Handbook Features ◆ 159
Features
Using Line-to-Line Transfer to set up a Tandem Call
In these instructions:
[Super Display Soft Key]
[Keyset Soft Key]
To set up a Tandem Call via line-to-line Transfer:
1. Place or answer an outside call.
2. Press TRANSFER .
3. Place or answer another outside call.
4. Hang up to set up a Tandem Call between your initial call and new call.