Integration SIP with PJSIP

Hello people, this is my first post here so scuse me my low knowlodge of asterisk and my bad english. So this is my problem:

I have an asterisk system configured with PJSIP, i used that because the better performance that it allow. The problem is that when i receive a call from an external asterisk the REGISTER command is rejected because the it not found as an endpoint. I was search and found the way to make an anonymous endpoint in pjsip, but when i put it in another context, then i can, with DIAL command, dial a extension that is defined in asterisk, the error say that this endpoint is not defined, so how i can expose the aor of another context to the context of the anonymous. All the endpoints are configurated with pjsip_wizard.