SBC Controller

[BEXTECH]

Question. Im using the rasberry Pi for the SBC controller. If the max is 20-30 phones. If i get more phones do i need to install another SBC controller?

 

[NicholasP_3CX]

3CXs Session Border Controller on a Raspberry Pi can handle up to 50 devices.
If you need to add more devices, yes, you will need to have a 2nd Raspberry Pi installed in the network.

Then you will be able to select which phone connects to which SBC.

https://www.3cx.com/docs/recommended-hardware-specifications-for-3cx/

 

[BEXTECH]

awesome thanks

 

[Alphabetic]

Also, spreading your devices over multiple SBCs is not a bad practise as you will have a single point of failure using one SBC. Pi's are pretty cheap - it's worth investing for the sake of high availability.

 

[NicholasP_3CX]

With the new SBC High Availability there is no longer a single point of failure.

 

[Alphabetic]

But you need 2 devices?

 

[NicholasP_3CX]

Thats right.
But having 2 separate SBCs still requires you to assign each phone to a single SBC.
Having an SBC HA Cluster will allow you to assign a phone each cluster, so if an SBC goes down the other will take over.
You would need 2 SBC per 100 phones in this case.

 

[Alphabetic]

But, you could also have 2 SBCs in HA for 50 phones.. Redundancy is what im talking about.

And even If you didnt have 2 SBCs in HA mode and one SBC failed, you still end up with some phones on.

 

[NicholasP_3CX]

Thats right. My comment for 100 phones was for Debian, but for the Pi, it would be 2 devices for each 50 devices.
The question of the thread though was for what happens above 50 devices with a Pi. So, without High Availability you could easily add the 2nd device for the additional phones.