dbg trace receive log

Hi,

I am C++ folk and Erlang navice. I am trying to use dbg trace APIs in our Erlang application to capture send/receive calls.

Docs says ->
Log 1 -> {trace, Pid, ‘receive’, Msg} where Pid is receiver’s Pid,
and
Log 2 -> {trace, Pid, send, Msg, To} where Pid is sender;s Pid and To is receivers Pid.

How can i get sender’s Pid in Log1

As i already have mentioned i am a new bee for erlang may be i am missing some concepts.
Any help in this regard would be highly appreciated.

Thank you.
Regards
Abhay