Call

You conjure forth a magical gateway through the material component used for this spell (about 1 ft. in diameter) between you and a willing creature you choose that is on the same plane of existence as you. The window appears in front of the other creature as a floating, ethereal, flat disk that follows their movement if the creature moves more than 5 ft. away from it.

For the duration, creatures can see and speak through the window to any other creature on the other side. The window is completely ethereal, and cannot be damaged. When called by this spell, a creature can choose to not answer the response, in which case the spell ends. At any time during the spell's duration, the other creature can choose to end the spell (no action required). When you call a creature who knows you, they automatically recognize that you are casting this spell before they answer the call.