Nokia 3555 - Manual (Page 85)

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You can either accept or reject an incoming one-to-one call if you have set
the phone to first notify you of the one-to-one calls.
When you press and hold the PTT key while the caller is talking, you hear a
queuing tone, and Queuing is displayed. Press and hold the PTT key, and wait
for the other person to finish; then you can talk immediately.
■ Callback requests
If you make a one-to-one call and do not get a response, you can send a request
for the person to call you back.
Send a callback request
You can send a callback request in the following ways:
To send a callback request from the contacts list in the Push to talk menu, select
Contacts list. Scroll to a contact, and select Options > Send PTT callback.
To send a callback request from Contacts, search for the desired contact, and
select Details. Scroll to the PTT address, and select Options > Send PTT callback.
To send a callback request from the channel list in the PTT menu, select
Channel list, and scroll to the desired channel. Select Members, scroll to the
desired contact, and select Options > Send PTT callback.
To send a callback request from the callback request list in the Push to talk
menu, select Callback inbox. Scroll to a contact, and select Options > Send
PTT callback.
Respond to a callback request
When someone sends you a callback request, Callback request received is
displayed in the standby mode.