msc: add counters to track call attempts/active/success/failed

active_calls describe all calls in active state.
call.complete Call got terminated by disconnect requested either by MS or MSC.
call.incomplete Call got terminated by any other reason.
call.active Calls reached active state.
Change-Id: I49b93af2e6a0ba16c2fb00b7b83974e8a6a16df3
3 files changed
tree: 9f907109afbeca0f6b36b1fbb6682dfd24f2b711
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview
  6. .mailmap