Considerations of Multiple Router phones as SBCs at the Same Physical Location

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Mike Shintani

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I expect we will have approximately 28 regular phones at our single physical site - and we are on Hosted. My approach will be to have three phones designated as Router Phones (as the SBCs), each serving about 8-10 regular phones as their SBC.

I understand one downside to this is the risk a Router Phone being disconnected - bringing down the phones it's serving. I may put these three Router Phones in our server closet so they are not disturbed. Outside of this risk, are there any other down sides to running multiple Router Phones as SBCs because if the 10 phone max?

In this setup, how do internal calls (from extension to extension) between two phones on the same LAN (same physical site), that are tied to different Router Phones, function? Will the call traffic traverse the WAN (Internet) to 3CX Hosted or will all traffic remain local to the LAN? If the internet will be needed, is this just call setup/control traffic going to 3CX Hosted and back - or - is this the voice stream as well?

Are there any other considerations to be aware of?

Possibly related - two users in our office, with phones on different Router Phones, said when they called each other that the phone screens showed that a call was made and in progress but there was no audio. This happened intermittently, sometimes the audio was there and sometimes not. It never seems to happen with phones calling each other that share the same Router Phone.
 
Hi Mike, you are right.

The talking parties are bound to the SBC connections and decision to route the traffic locally is made if both belong to the same virtual circuit. Thus, the media streams of internal calls between extensions behind different router phones will traverse the WAN. This is not related to the router phones, standalone SBC connection works the same way.

As to the absence of audio, we'll need verbose logs for both onboard SBCs and also PBX to be able to troubleshoot.
 
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I may put these three Router Phones in our server closet so they are not disturbed
In that case why not setting a Real SBC (running on small computers Debian or Windows) in your technical bay.
Phone SBC router is for now fresh DEV from Brands and 3CX and seems not always as reliable as it is with a real SBC
 
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