FWSM fixup infos for mgcp and skinny

Unanswered Question

Hi net pros,


Can someone point me to more information about the fixup engines?!


We have to secure a callmanager server farm behind a fwsm, running version 2.3.3.9 - next week we will upgrade to 2.3.4.12.


We would like to use the mgcp and the skinny fixup engines here.


I was told that last time it was tested the fwsm had 100% cpu load and they had to disable the fixup engines / they just opened a huge range of ports for the rtp traffic.


Found only this about performance, but its kind of old documentation: (http://www.cisco.com/en/US/products/hw/switches/ps708/module_installation_and_configuration_guides_chapter09186a0080159caf.html#wp1039967)


Fixup connections, rate: 10,000 per second.

PC based fixup connections, rate: 10K per second.


We have about 20000 phones but i doubt they all register in 1 second :-) so the performance should not be an issue.


So now I'm search for more performance charts and of course for documentation how the skinny/mgcp fixup engines really work (what messages they read / what ports are opened dynamically / sample setup etc.)


Any information appreciated


Best regards


Juergen Bauer


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