Note I am not necessarily trying to achieve encryption here, I'm just trying to make his damn phone work. So I was wondering if anyone knows what settings would need to be changed, first on the Obihai and second in the PJSIP extension settings, to make this work, if that is possible. This all worked fine when he was on Comcast, but not on Tmobile. If I do 'pjsip show endpoints' it shows his extension is available. If he tries to place a call absolutely nothing appears in the Asterisk CLI, and if I try to call him it just rings until it goes to voicemail on my end but his phone never rings.

We were able to get a softphone working with IAX and that works, but his PJSIP extension is weird - he has an Obihai phone (basically like an Obihai ATA but with more service provider slots) and it will connect to the PBX using SIP (I assume registration happens) but he cannot make or receive calls. I am not using Tmobile's service (at least not yet) but one of the users of my PBX is, and since he switched he's been unable to connect using SIP. For those who have said that SIP works if you use TLS, I have a question.

Foxfi android gateway