[cisco-voip] CCM and fw design for long distance voice carrier

[gokhan senol]

hi
i got ccm 4.1.3 and 2851 router which has mgcp connection with ccm.
also i made an aggrement with an isp voice carrier for my long distance calls.
i have already have connection with this isp fpr my internet.
my CCM is behind of the FW/
isp router > FW > my lan (ccm and ip phones ..) 
so how can make design/
Should i make static nat for ccm or should i use 2nd ethernet interface of ccm with public ip and put 2nd ethrnet front of the firewall?
also how the ip phones will senn udp packets to the isp s h323 gateway.should i make nat for ip phones? which ports on the fw for ip phones?
thanks a lot


 
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