Use use_lchan/put_lchan for call handling to keep the channel up

Increase when the refcount of the lchan when we initiate a call,
get a SETUP message and put it when we want to release the call...

Once we have proper Q.931 support the use/put needs to be improved,
e.g. we currently do not allow to hangup from the network, and it
will ring until the end of time...

tree: 5562f8e489233fc4d95776920a1ab3c80b7dacf2
  1. tests/
  2. tools/
  3. AUTHORS
  4. configure.in
  5. COPYING
  6. Makefile.am
  7. README