[VIP-2020PT] How to switch to a different line to dial out?
Before dialing out, press the correspondence line number you want to use, e.g. want to use Line 2 to dial out, please press Line 2 and then dial out.
Before dialing out, press the correspondence line number you want to use, e.g. want to use Line 2 to dial out, please press Line 2 and then dial out.
