Summoning problems...

[E-Seal]

Okay, so I was on this night trying to play with some friends and they kept saying they didn't see my soul sign so I switched chars (my char I was on was on NG+ and they weren't), but it just kept saying session ended as soon as it moved me to their world. Does anyone have any solutions to this problem?

Also, is there a 25 level range for you to help other people?
Is it possible for a player on NG+ to help a starter?

Any answers are greatly appreciated. Thanks.

Edit: Yes, I do know how part of the summoning works. One in soul form the others in spirit form and in a place that the person in soul form has not yet completed. But I really do wish to learn the other aspects to the summoning on this game.

[samsengir]

One in physical form the others in spirit form and in a place that the person in physical form has not yet completed

Fix'd.

NG+ players can certainly join or be joined by NG players as long as they are within a certain soul level of each other.
Below SL 100 there is a 10 level leaway for summoning while SL 100+ has a 25 level leaway.
I can't recall any session ended messages popping up but I have had a fair few failed connections which could have been anything from connection problems at either end, the person I was joining or joining me may have died, the boss may have been killed or in the case of Black Phantoming the last fog may have been activated.

Erm. When I say person you may substitute character instead. Either will cause gaming problems but one is a little more serious than the other...

[E-Seal]

Thank you so much samsengir, I knew about the difference of 25 in SL to invade but I had no idea that was SLs 100+ and I also had no idea that was the same with summoning although I had guessed it was.