I don't know if you were directing this to me Mike/KB8JNM or not

Your message is to the dvswitch main group @ goups.io

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Ports do not have to be 'any certain port number' except:

to not conflict with any port number in use &

to match the port number where it is handshaking TO or FROM.

If you look at the HOW2, there is a nice graphic showing the digital flow of ports for dmr to asl.

I use (analog_bridge.ini)

fromDMRPort = 31100                 
toDMRPort = 31103 

It must match the port number it interfaces with in

dvswitch.ini

TXPort = 31100                  ; Port to send AMBE TLV frames to (export)
RXPort = 31103                  ; Port to listen on (import)

The port number you use are up to you. But they must match where they are going to or coming from without conflict.

All modes/formats would be they same.

...mike/kb8jnm