"External" probably means the tg has an active patch from another system. For example, our state's DNR police has a legacy VHF system which patches some of its conventional repeater channels to its corresponding tg on the new statewide 700 TRS. The src= value is usually a RID which is likely not feature on the patched system.Picking up a local unencrypted PD talkgroup on a new P25 Phase 2 system with DSD+ fastlane.
The event log displays:
Group call; TG=10005 Src = EXTERNAL
What does EXTERNAL mean? It's not an alias that I assigned.