I've searched the phone number on TER and nothing came up. I've searched on google and came up with a link below. However, the ad was listed three months ago and the phone number may be listed to a new user.

http://tinyurl.com/mfcswte

As for the pictures on the ad, the pictures are scattered all over the internet. Most pictures depict the girl in several other countries working for an escort agency. Below is a sample.

http://tinyurl.com/mgu95y5

As for "Julissa" the Latin porn star, only two names were prevalent when I used google. It was Julissa Delor and Julissa James (both Latin). Julissa James does not resemble the pictures on Eros because it was a drastic difference. However, Julissa Delor did "resemble" the pictures. A brief physical description of Julissa Delor is listed below.

http://preview.tinyurl.com/mqt7qdt

The only two common characteristics that Julissa Delor and "Julissa" on Eros have in common is their age, which is 26 and they are both Latinos (although several sites state that she is Latino and others state she is not Latino but American). The pictures on Eros doesn't resemble the porn star Julissa Delor. The physical description of "Julissa" on Eros does not match Julissa Delor's physical description. For example, height, weight, hair color, or breast size is different.

The real Julissa Delor has 2 tattoos, each on her tits. A clip and her physical description is listed below.  

http://tinyurl.com/nyu5a8b
http://tinyurl.com/mqt7qdt

It's interesting because $300 is a respectable donation to TOFTT. However, I don't have enough information to find out exactly who the actual pornstar's identity is. I can say that the pictures that are used on Eros is definitely not the girl that will open the door.

These kinds of ads are tempting but I wished she had more information such as a personal website. You asked, "is it a fake or is it julissa delor?", and my answer is, I don't know for certain. It's tempting. Perhaps you can call her and get more information, doesn't hurt to find out and see how she is on the phone. If she is not helpful, well, then don't see her.