[Freeswitch-users] DNS SRV records

Hello! For a better usability (I don't want to expect my users to deal with IP addresses) and for a better manageability (I don't want to inform my users about IP address changes) I'd like to set DNS SRV records. But which port should I announce? The internal or the external port? What about soft phones on notebooks which are sometimes on my internal network and sometimes outside? Do they have to have two profiles? Or do I have to work with bind views? Thanks for any hint! Cheers, Micha