Ok is that for sipgate basic or business one? I have use sipgate.co.uk when I was using chan_sip before and it’s work perfectly but I have change to pjsip using the same setting that other people provide me seemly it’s work occasionally but I definitely will try your solution. So sipgate have change the setting if you telling me to do that.
I don’t know anything about SipGate Business. Sorry. But you have to try Basic PJ_SIP Trunk setting. (Just Disable exist SIP Trunk and add a new with PJSIP you don’t need to delete )
if not works i think you can connect with them, they have some ready wiki pages settings for Asterisk and FreePBX.