I have a GXP2135 which is working in TLS mode connecting to my FreePBX 18. But, it only works if I go into the phone interface and reduce the minimum version of TLS to 1.0. If I choose 1.1 or 1.2, the phone won’t register and I get errors on the pbx side similar to:
WARNING pjproject: SSL SSL_ERROR_SSL (Handshake): Level: 0 err: <336130315> len: 0 peer: x.x.x.x
I’ve seen some posts that said changing the the TLS version from Default to 1.1 or 1.2 in Advanced can solve this, but didn’t for me.
I do not have CHAN_SIP installed (although it was enabled one point, I have made sure the ports don’t match pjsip)
PBX is built from OOB distro from Sangoma (around 3 months ago.) All updates applied.
Any thoughts on what my next troubleshooting step to bring the phone at least to 1.1 (1.2 preferred) would be appreciated.