The service offered by telephone companies allowing creating the telephone numbers on the same line where the existing number is. The call tone for every number will be different from another. There is also an opportunity to program a custom ring tone for the incoming call.
Bangladesh White cli route aaLap Communication igw novotel
Bangladesh White cli route aaLap Communication igw banglatrac
Bangladesh White cli route aaLap Communication igw MirTelecom
Bangladesh White cli route aaLap Communication igw BTCL