V20 - Connection Issues - Stun - Remote Sites and Users

[bitn2]

You can run an SBC anywhere technically. If you know how to setup the port forwarding and IP restrict access to it, you can have phones remotely connect to it without risk of security issues. I have an SBC with a public IP. Inbound is completely restricted by source IP (dynamic DNS where needed). At first it worked without RTP ports open in the firewall, but that was coincidence. I simply had to open port 5090 and the RTP port range found in the config file of the SBC.

You don't need to open any ports at all for sbc...!

 

[Richard10]

You do when the SBC is not at the same location as the phone. I created an SBC somewhere (behind a firewall) that remote devices that are not router phones connect to.

 

[bitn2]

T

You do when the SBC is not at the same location as the phone. I created an SBC somewhere (behind a firewall) that remote devices that are not router phones connect to.

That's not the way to use an sbc with 3cx.

 

[Richard10]

Definitely not supported, but a very useful hack for an inconvenient situation.

 

[ZenMasta]

For what it's worth. I didn't disable anything. I just followed the guide's steps and everything else was defaulted per system settings I guess.