Hi. Doing a standard package-managed installation of Freeswitch under Debian using https://freeswitch.org/confluence/display/FREESWITCH/Debian+10+Buster I see that there are 20 internal extensions 1000 - 1019 already defined, and I've successfully registered a couple of phones to 1000 and 1001. Am I right in thinking that the default dialplan is supposed to allow calls between internal extensions, or do I have to configure something else for this to work? My setup is: - FreeSwitch installed under Debian 10 Buster on my home network 192.168.78.0/24 - two telephones configured manually to register to the FreeSwitch server, also on the same network 192.168.78.0/24 Result: - both telephones register to FreeSwitch successfully - dialling from one extension to the other causes the second extension to ring, and can be answered, but the SDP contents of the Invite requests from FreeSwitch to each telephone tell them both to send audio to the *external address* of my Internet router, not either the internal address of my FreeSwitch server, or the internal address of the other telephone. Obviously this doesn't work. This happens whether or not I start FreeSwitch with the "-nonat" option. So, I'm thinking there must be something simple that I'm failing to understand about the default configuration of FreeSwitch, because I thought that calling from one internal extension to the other was about the simplest test I could perform. Can anyone point me at "how to get started" for a simple scenario such as this? Thanks, Antony. -- Schrödinger's rule of data integrity: the condition of any backup is unknown until a restore is attempted. Please reply to the list; please *don't* CC me.