nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqd9gxrarq342j2xtrr5ven4c48ga8v5d3ry4nudusqk4pkcsuuqdstfs8h3 So basically, normally you can only connect to another SIP user via the Internet as an IP interaction.
A trunk was originally to do with how phone systems worked and actually physically...