Huawei U5200 Manual page 25

display "Push DC button to call xxxxxxxx." Then you can do the
following:

Press the right soft key to select Cancel. Then press the Send
key to return to the voice call screen.

Press the left soft key to select Alert. An alert will be sent to
the other party.

Push and hold the DC button to make a DC call.
Receiving a DC Group Call During a Voice Call
When you receive a DC Group call during a voice call, the phone
displays "Missed DC Group call From: xxxxxxxx." At this moment,
press the right soft key to select Ignore and continue with the
voice call; press the left soft key to select Hold and the phone
will display "Push DC button to call xxxxxxxx." Then you can do
the following:

Press the right soft key to select Cancel. Then press the Send
key to return to the voice call screen.

Press the left soft key to select Invite. An invitation will be sent
to the group members.

Push and hold the DC button to make a DC call to the group
call initiator.
Receiving an Alert During a Voice Call
When you receive an Alert during a voice call, the phone displays
"Incoming Alert From: xxxxxxxx." At this moment, press the right
soft key to select Ignore and continue with the voice call; press
the left soft key to select Hold and the phone will display "Push
DC button to call xxxxxxxx." Then you can do the following:

Press the right soft key to select Cancel. Then press the Send
key to return to the voice call screen.

Press the left soft key to select Alert. An alert will be sent.
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