Difference between CHAN SIP Device and PJSIP

Hello I’m setting the extensions, and I want to know the difference between CHAN SIP device and PJSIP.

All you need to know is that you should select CHAN SIP.

Also, you should probably be using Asterisk 11, which is very stable. Asterisk 13 is not stable (or so I’ve read).

People should choose what they want instead of following a blind statement like this. What are your reasonings?

If you have to ask the difference, it’s likely because you’re very new. If you’re new, you should avoid PJSIP and Asterisk 13 for that matter given that they are both experimental.

If you’re not sure, Asterisk 11 and ChanSIP are the correct answer, at least for now.