[SR-Users] Limiting simultaneous calls

[Juha Heinanen]

Stefan Sayer writes:

> if it's acceptable for you to use an external B2BUA, you could send 
> the calls through SEMS' sbc, activating session timers there and using 
> parallel calls cc_pcalls to limit.

what if parties of the call do not support session timers and do not
(for one reason or another) send byes to terminate the call?  can your
example configuration still detect that the parties have gone away
(assuming that only signaling goes through sems)?

limit_calls_sst.sbcprofile.conf:
  call_control=parallel_calls
  parallel_calls_module=cc_pcalls
  parallel_calls_uuid=$fU
  parallel_calls_max_calls=1
  # enable session timers - will refresh
  # even if endpoint doesnt support it
  enable_session_timer=yes
  # refresh every minute
  session_expires=120

if not, i guess one needs to replace enable_session_timer with call
call_timer_timer.  if so, how expensive are call_timer_timers from
implementation point of view?

-- juha