Question: Which of the following statements accurately describes the scope of the 'GTP.OutSigOctGnSGSN' measurement on the Gn interface between SGSNs?
Option 1: It exclusively measures GTPv1 signalling packets, ignoring GTPv0.
Option 2: It only counts incoming GTP signalling packets from the peer SGSN.
Option 3: It provides a total count of outgoing GTP signalling packet octets, regardless of the GTP version used.
Option 4: It is limited to circuit-switched traffic and does not account for packet switching.
Explanation: The correct answer reflects that 'GTP.OutSigOctGnSGSN' measures the total number of octets of outgoing GTP signalling packets on the Gn interface, encompassing all GTP versions. This is crucial for comprehensive performance management in UMTS and combined UMTS/GSM networks, allowing operators to monitor overall signalling traffic efficiently.