对无应答用户的呼叫转移的英文

cfnry call forwarding on no reply supplementary service

• 对:    answer; reply
• 无:    not have; there is ...
• 应答:    reply; answer; res ...
• 用户:    user; subscriber; ...
• 的:    4次方是 The fourth po ...
• 呼叫:    call out; shout
• 转移:    shift; transfer; d ...