[Freeswitch-users] re-invite to bridge

Hi, I'm new in FS. I don't understand why FS doesn't forward invite to a gateway. Here is the scenario. 1) A SIP client make a SIP call to FS 2) FS bridge the call to a gateway 3) the client send the invite again (disable video) 4) FS doesn't forward the invite to gateway Is it normal? Or do I need to configure any parameter? Thanks.