Sennheiser Momentum Wireless M2 AEBT Instruction Manual page 24

Using the headphones
22 | M2 AEBT
Transferring the call to/from the headphones
Once the connection is established, you can transfer the call between the head-
phones and your smartphone.
Press the 3-way multi-function button.
X
Press Function
1 s
1 s
Transfers a call from
the headphones to the
smartphone
Transfers a call from
the smartphone to the
headphones
Voice prompt