Hello, there are two tutorials in the official blog: part I : https://blog.opensips.org/2020/05/07/sip-push-notification-with-opensips-3-1-lts-rfc-8599-supportpart-i/ part II : https://blog.opensips.org/2020/06/03/sip-push-notification-with-opensips-3-1-lts-rfc-8599-supportpart-ii/ -- best regards, Alexey https://alexeyka.zantsev.com/