1. 2021-11-30 [6] [Sip-implementors] SIP REGISTER MESSAGE flow sip-imple Arun Tagare 2. 2021-11-22 [1] [Sip-implementors] [CFP] 4th International workshop i sip-imple Sergio_Gonzá 3. 2021-11-19 [1] [Sip-implementors] SIPit 33 sip-imple Robert Sparks 4. 2021-11-11 [1] [Sip-implementors] One Month Till SIPit 33 - Focused sip-imple Marc Robins