Audiovox GSM 900 system - Manual (Page 47)

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Next Call (3-6)
Your handset can receive voice, data and fax calls. Depending on your network
service provider, you may have to select among the voice, data and fax calls
under this option before you can receive them correctly. This scenario only
applies to one number scheme network service providers (i.e., the voice, data
and fax calls are all transmitted via a single telephone number).
Consult your network service provider to decide if you need to do such a
setting.
Press key, and the following options will appear:
Voice
Press key to set the next call as a voice call (This is the default
setting).
Data
Press key to set the next call as a data call.
Fax
Press key to set the next call as a fax call.
After you receive a data or fax call, you will need to change the setting back to
“Voice” in order to receive ordinary voice calls.