364662a6_Manager__CallManager_____Cisco_Table_52_Network_Interface_Counter_Descriptions
[Counters] Tx Packets [Counter Descriptions] 
This counter represents the total number of packets that the higher level protocols requested for transmission, including those that were discarded or not sent. This does not include packets that were addressed to a multicast or broadcast address at this sublayer.
Cisco Unified Communications Manager Managed Services Guide, Release 9.1(1) - Cisco Unified Real-Time Monitoring Tool Tracing PerfMon counters and alerts [Cisco Unified Communications Manager (CallManager)] - Cisco