Maybe you shouldn’t have switched to chan_sip before posting the rest of your pjsip settings. But anyhow, here are my chan_sip settings:
Of course, your user and trunk names will be different.
Assuming that you are using the default ports (pjsip on 5060 and chan_sip on 5160), in the 3102 you need to change Proxy to 192.168.1.175:5160
Also, if this is your first chan_sip trunk or extension, you’ll need to permit UDP port 5160 in whatever firewall you may be running on the PBX.
If you still can’t register, see if anything gets logged for the attempts. If not, it’s probably a firewall issue.
Or, post your pjsip and 3102 details as previously requested and we’ll try to debug that.