'ignore_call_channel' setting seems to have no effect

[Emre Gundogan <emre () gundogan us>]

Hi. I am running Snort (V2.9.4.6) on a firewall + IP-PBX. Is it normal that, on a typically idle machine, Snort takes 
up roughly 7-10% of CPU for each concurrent media session?  The SIP preprocessor is enabled and 'ignore_call_channel' 
is set in the configuration. With this setting, I expected snort to ignore RTP traffic in a SIP session. But based on 
my limited experience so far, that's not happening, as the CPU stays constant around 10% (all used by snort process) 
for the entire session. Add a second call, and the CPU goes to 20% (snort process). Am I doing something wrong here? 
Thanks a lot.

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