NEC DS2000 Feature Handbook page 180

Split
To Split between your current Intercom call and an outside
call:
1. Press
2. Place or answer outside call.
3. Press your Split key to switch between your two calls.
To Split between your current outside call and a waiting
outside call:
1. Press
then hang up.
2. Place or answer a new outside call.
3. Press your Split key to switch between your two calls.
172
to place your current Intercom call on Hold.
to place your current outside call on Hold,