3CX and SBC (session border controller)

[inter-rupteur]

Hi,

i ofen hear of SBC (Session border Controller: level 7) that it secures better than a firewall (level 3 and 4), connexion between UA and IPbX ! Is 3Cx include this mecanism ?
Can I use something other than SBC because it's very very expensive...

Thanks a lot !
Inter-Rupteur