pabx用户: user; subscriber; consumer; ...专用: special use; for a special p ...交换机: exchange board; switchboard集中式用户专用交换机: centrex centralized extension system企业用户专用交换机: pbx下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:用户专用交换机,即可在微信中查询翻译