Ultratec CAPTEL 200 Manuale Utente

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With 2-Line CapTel, calls placed through a traditional relay service are
handled the same way as if you’d called from any other type of phone,
plus you get captions of everything the other party says.  To call a
TTY/VCO user through relay:

Pick up the handset and dial 711.

Give the relay CA the phone number of the person you’d like to call.

Watch the display screen for instructions and captions of the TTY

user’s responses via the relay CA. 

NOTE: The process for calling 711 is different when using 1-Line
CapTel, which automatically converts 711 calls to Voice Carry Over
(VCO).  Please see Dialing 711 on page 27 for more information 
about how 1-Line calls through relay are different than 2-Line calls.