This read-only integer, either 1 or 2, identifies which of the ComPort's two voice ports a given row of voice-channel statistics describes, corresponding to the same two ports reported by stuVoiceAimPort1Status and stuVoiceAimPort2Status. An admin needs this to know whether a set of cell counters describes the subscriber's first or second phone line when the device supports two lines. For example, on a two-line business account, support would check stuVoiceChanStatsNum equals 2 specifically when only the second phone number is reporting call-quality problems.