[aprssig] on a multi-TNC digipeater, which callsign should be traced?

[John Langner WB2OSZ]

Dire Wolf inserts the callsign of the transmitting radio channel.  

When the hop count of a WIDEn-n pattern gets decremented to 0, substitution
is used instead.

Some other implementations always insert, and never substitute, which can
cause confusion about the path taken.

The Dire Wolf User Guide (
https://github.com/wb2osz/direwolf/blob/dev/doc/User-Guide.pdf ) discusses
this in more detail with examples in the  "Digipeater - Compared to other
implementations" section.