Topcom Butler E400 User Manual page 29

3.6 Internal call transfer
1
INT
2
4 5 6
GHI JKL MNO
3
INT
4
3.7 Conference call
1
INT
2
5 6
4
GHI JKL MNO
3
#
INT
4
3.8 Speaker volume during call
1
3.9 Display of call duration
3.10 Microphone mute
1
2
3.11 Pause key
1
#