To lay some groundwork, I have an SPA 192 that we're using for streaming audio services (music on hold) however due to a bug in the SPA192 it refuses to negotiate SENDONLY audio which means i must use a conference bridge style call to establish the music on hold with inbound callers.
This is obviously not ideal as I don't want my customers talking with each other on hold.
I already have a firewall in place, a watchguard firebox that nobody can seem to figure out how to make work the way we want it to.
What I want to do is some sort of packet inspection and block all inbound UDP RTP traffic from my vendor's SBC, BUT ONLY to the SPA192. Is this doable on OpenWRT?