Preventing FreePBX from using a network

FreePBX Networking
1

Hi lovely people, I need your help figuring stuff out!
We are running FreePBX 17 for an internal telephony system, this system has 3 network interfaces
10.9.148.11/28 which is “management/gui access”
172.30.0.5/23 which is needs voip
10.10.10.148/24 which needs voip too

interface 2 and 3 must support voip and interact, interface 1 no.

At the moment while using wireshark we are seeing stuff like this which is really not what we want:
From: “ <sip:[email protected];tag=”

We tried adding the following to pjsip_custom.conf with no luck,

[transport-udp-internal-1]
type=transport
protocol=udp
bind=172.30.0.5:5060

[transport-udp-internal-2]
type=transport
protocol=udp
bind=10.10.10.148:5060

Disclamer: I’m in no way a telephony expert, just the goto guy for linux stuff and im quite baffled.

2

If that is the only problem line, set the from domain. Only Contact and Via headers, and the c= line in the SDP, should be used when actually setting IP destinations, by the remote system.