So even if I do work out how to configure my problem trunks with pjsip and get them working how will I overcome the problems of unreliability.
Is pjsip supposed to be the finished product in freepbx 13 or will there be considerable improvements to follow. It feels to me that NAT is not well supported (easy to configure and control) in pjsip and if the pbx is behind a router with a dynamic IP address pjsip is not a viable option at the moment.
Trying to work with pjsip compared to chan_sip currently feels like a big step backwards, or have I just lost the plot here.