Cannot get Linphone to work on iOS

When I first started, I installed Linphone on my Linux laptop and two 
iOS devices, and it worked briefly - then would randomly end a call 
after maybe 2 minutes, and therefore could not be relied on.

I had to stop investigating, but recently wanted to get SIP working, and 
now have a different issue, where on iOS, the devices show that the 
server isn't connected.

On Linux, it seems to indicate the server is connected, and having 
checked the settings between the two, they seem equivalent, so I am 
really stuck.

Any help would be most appreciated.

Many thanks,

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