Starting with VitalPBX 4 we decided to completely remove SIP in favor of PJSIP, since this new technology provides better functionality.
Also Asterisk decided to stop supporting SIP from version 17 and will remove it completely in version 21, which will be released very soon.
Don’t worry, the VitalPBX Team has adapted the interface so that the transition from SIP to PJSIP is as user-friendly as possible. Everything you did in SIP, you can do with PJSIP.
We invite you to see the following link:
https://www.asterisk.org/asterisk-21-module-removal-chan_sip/
