...示-D term （I-Hold Indication- D term ） 使用指示-D term （I-Use Indication- D term ） 内部通话呼叫 （Intercom Calling） 分机号码显示-D term （Intermediate Station Number Display- D term ） 内部摘机队列 （Inter-Office Off-hook Queuing） 即时...
Aside from boasting an integrated Bluetooth chip for handsfree calling and voice activation, there's also a built-in FM radio and an intercom system that enables up to four riders to communicate within a full mile of one another.