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!

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