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Problem with the service

Hello,
I have a SPA8000 ata converter connected to six analog phones.
I had set a different port number for each of them on SPA8000, but almost every month regularly 1 or 2 extensions stop registering and I have a hard time fixing it with a stupid trial and error strategy.

If I set the default port number and domain for all of them, they register, receive, but do not call.
Should I use one port number or six different ones?

Could you suggest anything?
Thanks a lot
S.