Looks like this is:
.1.3.6.1.4.1.9.0.1
tcpConnectionClose OBJECT-TYPE
-- FROM CISCOTRAP-MIB
TRAP
VARBINDS { tslineSesType, tcpConnState, loctcpConnElapsed, loctcpConnInBytes, loctcpConnOutBytes, tsLineUser }
DESCRIPTION "A tty trap signifies that a TCP connection, previously established with the sending protocol entity for the purposes of a tty session, has been terminated."
