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dialing mode(selector)T/P拨号模式选择emergency call(key) 紧急呼号系统EXT/TRF(extension/traffic).分机/转换frequency range频率范围flash call特急通话、呼叫flash time switch记发器重呼时间选择开关hook/flash button免提拨号/瞬间
dialing mode (selector) T / P dialing mode selection emergency call (key) Emergency call system EXT / TRF (extension / traffic). ext. frequency range frequency range flash call emergency call, call flash time switch Switch hook / flash button Happen / Instant