市内电话电话号码配换选号
Selection or Change of Telephone Number
《国际电话号码本》
international telephone directory
电话号码
telephone number
branch on zero instruction
TN Telephone Number
phone numbers
Telephone numbers
phone number
phone code
电话号码配号管理系统
telephone number assignment system
电话号码资源
telephone number resources
非标准电话号码
NSTN Non Standard Telephone Number
记账电话号码
BTN Billing Telephone Number