OK, the following should get incoming POTS calls ringing on your Mac and the CLI showing there too.
I don't (on principle) have any Apple stuff so cannot advise you on a specific soft client. You need to know the IP address of the Mac and the port number that your softphone is listening on. The IP address needs to be unchanging; either set a static one on the Mac itself or, if DHCP, configure the router to always give it the same one. By convention the default SIP port is usually 5060.
The Obi110, like all Obis, can be configured either using its onboard web server or via the portal dashboard of your account at
obihai.com. Decide which method you are going to use and stick to it. If you are going to have Google Voice, then you MUST use the portal to configure that so it makes sense to start and continue with the portal. The changes you will make are only available from the Expert Mode mode of the portal. You need to clear any ticks in both boxes at the right hand end of a line before you can edit the field. Click the Submit button at the bottom and wait for the OBi to reboot before moving to a different page.
If you don't already have a SIP based Service Provider configured on the OBi you need to set up a dummy one.
Service Providers, ITSP Profile A, SIP, ProxyServer: 127.0.0.1
Voice Services, SP1 Service, AuthUserName: (any userid)
Voice Services, SP1 Service, X_RegisterEnable: (unchecked)
Voice Services, SP1 Service, X_ServProvProfile: A
To forward the CallerID
Service Providers, ITSP Profile A, SIP, X_SpoofCallerID: checked
Under Physical Interfaces, Line Port there is the InboundCallRoute. The default setting is ph which means the PHONE jack. If you want incoming calls from the POTS line to ring only the softphone change that field to
sp1(@192.168.1.xyz:port)
where the xyz completes the IP address of your Mac and port is that of the softphone. If the port is 5060 then ':port' can be omitted.
If you want incoming calls to ring both a physical phone plugged in to the PHONE jack and the softphone then change the field to
ph,sp1(@192.168.1.xyz:port)