[VOIPSEC] SBC and Firewalls

[Mo Khan]

Hello. I was wondering if there are folks who have implemented the use of
SBC and Firewall together to protect their voip environments. I was looking
to see if it makes sense to use SBC along with an enterprise level Firewall
to secure SIP Trunks over MPLS. I know most SBCs come with a built in
application layer firewall feature which is voice friendly but to gain
control of the environment we want to introduce Firewall to the mix.  The
SIP Trunks are setup from corporate HQ over to  multiple outsourced partner
contact centers. To create a defense in-depth strategy, a SBC, FW and an IDS
will be used. Any suggestions comments experiences on this type of setup
would be help full.

Regards.