Voice Gateway outside firewall, CUCM inside

Unanswered Question
May 8th, 2009

If I have the voice-gateway for a CUCM outside the firewall, what NAT statement and port are needed for the configuration of the firewall?

I have this problem too.
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sachinraja Fri, 05/08/2009 - 09:42

Hello Steven

Following URL lists the ports used by CUCM with various components:


Is there any access-restriction applied on the inside interface of a firewall ? If so, you will have to open up appropriate ports as listed on the pdf.. make sure you open UDP 16384-32767 for communication between voice gateway to CUCM on the outside interface, for return voice traffic..

you can just give a normal static statement, which does not nat the traffic.. eg, if the CUCM has as ip, u can give

static (inside,outside) netmask

or the other way around by natting the gateway IP address..

Hope this helps.. all the best.. rate replies if found useful.



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