How to use register in pjsip

It’s odd, it’s been working fine for 12 years using SIP and with PJSIP it’s suddenly a problem. Any particular PJSIP debug commands I should use. I cant find documentation. What I see or I guess don’t see after setting debug on is any registration attempts by Asterisk. Should it not do something ever retry_interval seconds if I put that in the type=registration section?