Allows users tracking the condition of the other telephone or the subscriber, for example, there will appear a signal on the screen of the telephone device informing that the subscriber is on the line and is temporarily unavailable.
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