Turn on tracing

I have 2 asterisk servers. In the CLI console of one of my servers, I can see users being registered and calls taking place.
The my other server does not do this. How can I turn on tracing? Thanks

It looks something like this:

[Jul 29 13:56:37] NOTICE[1929]: chan_sip.c:24093 handle_request_subscribe: Received SIP subscribe for peer without mailbox: sambengtson == Using SIP RTP CoS mark 5 == Using SIP RTP CoS mark 5 -- Executing [7157814987@LocalSets:1] MixMonitor("SIP/sambengtson-00000007", "testrecord4.wav") in new stack == Begin MixMonitor Recording SIP/sambengtson-00000007 -- Executing [7157814987@LocalSets:2] Dial("SIP/sambengtson-00000007", "SIP/7157814987@baldwintelecom,30") in new stack == Using SIP RTP CoS mark 5 -- Called SIP/7157814987@baldwintelecom -- SIP/baldwintelecom-00000008 is making progress passing it to SIP/sambengtson-00000007 == Spawn extension (LocalSets, 7157814987, 2) exited non-zero on 'SIP/sambengtson-00000007' == MixMonitor close filestream == End MixMonitor Recording SIP/sambengtson-00000007

Try changing the verbose level with: core set verbose “number”, i.e. “core set verbose 3” for level 3.

ahh perfect thank you!

you also can edit the logger.conf and reload asterisk, the debug info will be more.