The value of tmnxMobGwNtfyGtpPriGrpReasonCode indicates the reason
why the GPRS Tunneling Protocol (GTP) Prime Server Group has been
brought down.
The value of 'remoteDisconnect' indicates that the remote side has
closed the connection.
The value of 'localDisconnect' indicates that the local side has closed
the connection after the dead-timer is expired.