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Phone calls always take priority over PTT calls.
Besides the packet data counters, the phone registers only one-to-one calls in the
recent calls lists in Log. The participants should confirm the reception of any
communications where appropriate as there is no other confirmation of whether
the recipients have heard the call.
To check availability and costs, and to subscribe to the service, contact your
service provider. Note that roaming services may be more limited than home
network services.
Many of the services available for traditional voice calls (for example, call
mailbox) are not available for PTT communications.
Define a PTT access point
Many service providers require you to use an internet access point for your default
access point. Other service providers allow you to use a WAP access point.
Settings for PTT
For PTT service settings, contact your service provider.
To view and change PTT settings, select Menu> Settings > Connectivity > PTT>
Options > Settings > User settings or Connection settings.

User settings

Accepted list calls—To see a notification of incoming calls, select Notify. To answer
PTT calls automatically, select Auto-accept. If you do not want to receive PTT calls,
select Not allowed.
PTT call alert tone—Select the tone for incoming PTT calls. If you want the
incoming call alert setting for PTT to follow your profile settings, select Set by
profile. For example, if your profile is silent, PTT is set to do not disturb (DND) and,
except for callback requests, you are not available to others using PTT.
Callback request tone—Select a tone for callback requests.
Application start-up—To start PTT automatically, select Always automatic. To start
PTT automatically only while in your home network, select Auto. in home netw..
Default nickname—Enter your nickname shown to other users. Your service
provider may have disabled the editing of this option.
Show my PTT address—Select Never if you want to hide your PTT address from
others.