What is a Q.931?
Q.931 is a communications protocol for bidirectional switch-to-switch communications in an ISDN network. The Q.931 protocol was a breakthrough technology in that it allows end-to-end communication information to be passed even from customer provided equipment through the telephone network.
For example, when initiating an ISDN call, remote equipment can provide meaningful information about the status of a call to the calling party.
"Alerting Status" is the equivalent of ringing on a telephone.
"Normal Call Clearing" status indicates the user "hung up" a call.
"No Channel Available" status indicates there is some type of network congestion.
ISDN communications use Q.931 messaging and this pre-defined set of call management steps provides extraordinary ability to troubleshoot and maintain network that are based on ISDN.
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