[VIP-256PT] How to switch to different line to dail out?
Before dial out, press the correspondence line number you want to use, ex: want to use Line 4 to dial out, must press 2, to switch to line 2 then dial out.
Before dial out, press the correspondence line number you want to use, ex: want to use Line 4 to dial out, must press 2, to switch to line 2 then dial out.
