Motorola TETRA MTP850 Feature User Manual page 130

Wait for the delivery report before sending a new status.
If you enter the status menu from a busy talkgroup, audio is
momentarily suspended to allow transmission of your status
message.
If an Emergency call is received, the MTP850 immediately joins the
Emergency call.
If set up by your Service Provider it is not possible to send a status
message to a private number that is not in the Contacts List.
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