How to call for help (Dark Souls 3)

Good day, comrades.
Finally decided to start with this series and started with this part.
Everything seems more or less clear, the situation was handled BUT
On high wall somehow twice called phantoms to help him. It was healthy and cool. Now 6th location and sometimes very much needed assistance, but to call the phantom or another player absolutely incomprehensible. Very often I call to him for help and we are there in your party hit a mob.
How do I call in to help the phantom or of the player?