Nokia BH-900 - Manual (Page 13)

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indicator light flashes continuously. The mute function cannot be used during a
PTT call.
■ Push to talk (PTT) calls
You can use the headset to make and receive push to talk (PTT) calls. To use this
network service, your phone must support it and the function must be set to on in
the phone. For more information on the PTT function, contact your network
operator or service provider and see the user guide of your compatible phone.
To make a PTT call to the default PTT channel defined in your phone, press and
hold the middle of the volume key (while no call is in progress) as long as you
speak.
When you receive a PTT call while no call is in progress, the headset beeps, and you
start to hear speech from the channel. To answer and speak to the listened
channel within the time defined by the network operator or service provider, press
and hold the middle of the volume key as long as you speak. To answer and speak
to the default channel after the time defined by the network operator or service
provider, press and hold the middle of the volume key as long as you speak.
■ Switch a call between the phone and headset
To switch the phone call or PTT call between the headset and a compatible Nokia
phone, press and hold the answer/end key, or use the respective function in your
phone.