VT700GV series is design for a calling card system , most scratch calling card , user need to listen the IVR instruction , and key in his PINS .
VTC700 GV series also can support to show the SIP message on the Display .
By this way , the phone display can show " error reason " , "remain credit " , on the remote terminal ( public phones).
VT700GV support 4 speed button which can be defined as for service , or different language choice .
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