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I am trying to make use of Linphone on an Ubuntu machine, but everytime I run the software I get the following message:

"Could not start tls transport on port 5060, maybe this port is already used."

I've been looking for a solution through Internet but I've been not lucky so far.

The Ubuntu firewall (UFW) is disabled. I get nothing when executing "lsof -i :5060" (being and not being a superuser)...

BTW, I satisfactorily employed Linphone to communicate two smartphones.

Any ideas? Any help is really appreciated.

Thank you!

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