Failover

Javi <[email protected]>
Newsgroups gmane.ietf.megaco
Message-ID <[email protected]> 
When an optional secondary unit of a MG detects a maintenance or failure 
outage of the
primary MG unit and the primary is unable to notify the MGC of the 
failure, the secondary
MG shall send a ServiceChange Command to the MGC with ServiceChangeMethod
"Failover"

How does secundary MG detects that primary MG is failing?, may primary 
MG sends
any command warning about it?

Javi
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