A former advisee transferring from one college to the other, all within the US, asked me what she’s supposed to do now that she’s received her I20. I referred her back to her colleges but one is not answering and the other one is referring her to the other…
Is she supposed to go back to the embassy foe an interview? To clip the new i20 in her passport?
Apparently when you call the embassy you have a recording and they do 't answer anything in that topic… And I don’t want to give her bad advice.
So far I’ve told her to google it. 
What happened to her SEVIS record? That’s the important bit.
If the SEVIS record got transferred from the old college to the new college, and the new college printed a new I-20 off of the same SEVIS record, then she can just keep the new I-20 in her passport and she’s good to go.
If the new college opened a new SEVIS record for her and generated an I-20 from there, she would have to leave the country and apply for a new student visa at an embassy abroad.
Here’s an excerpt from the SEVIS manual for Designated School Officials that explains how the SEVIS transfer would work: https://www.ice.gov/exec/sevp/Module5.htm
I’ve had to switch schools in the US before, so I can speak from experience; granted, it was high school, but the paperwork should be the same.
As long as the transfer went smoothly, her SEVIS record and number should also have been transferred over from her old school to her new school. In that case, the SEVIS number on the new I-20 is the same as that of the old one. This same number is on her visa, which should be attached inside her passport.
This makes things easier, because if the numbers are all the same, she does not need to go through any more extra work. Her visa in her passport will bear the name of her old school, but because the SEVIS code remains fhe same, she will not have to get a new visa or make any changes. All she needs to do is to keep the old I-20 just in case, keep it with her new I-20, and keep the same passport visa. She will have to present these to an immigration officer every time she enters the country during the time of her study.
If some miscommunication occured during the transfer and the SEVIS codes on the I-20 forms are NOT the same, she will have to talk to someone at her school’s international student office about it; she may have to get a new visa.