The app does not continue its execution after receiving an Invite

[Jperez903]

At first when I sent the Invite, the application rejected it with a "rejecting non-SIPREC INVITE". Then I added the Header "Content-Type: multipart/mixed" and I no longer get the rejected response.
Looking at the code, it should continue executing the next() function, but from there the app does nothing, or at least I don't see it.
Could you help me see what's happening?
Thank you so much.