Originally Posted by
Agonize
Good question... Some players on the Vilya server will indeed respect and participate in 1v1s... They would be the minority, by a longshot. Most 1v1s are not respected and will get zerged. The common 'signal' for challenging someone or commencing a 1v1 would be to jump up and down in front of them while not engaging. There used to be a 1v1 area called Candy Mountain, that has newly since been changed to TR rez. There is no new agreed upon 1v1 area to my knowledge, most common now a days would probably be good grim or that area above the Monstrous Stingers west of OC. I wouldn't call it out in OOC. Leave it be if you think it's a 1v1, chances are if you call it out, someone who doesn't respect 1v1s will just zerg the fight for easy points. Seeing other creeps and freeps sitting on the side watching a fight would be the biggest indicator of a fight.
Biggest issue you're going to have and I would start to take note of this is who respects and participates in 1v1s. That way you can know whether to jump in or not. If you don't jump in on someone who needs/wants help, they will cry until the cows come home. If you help someone who wanted to 1v1, they will do the same...
Hopefully this helped out at least a little bit!