I received your PM.
SP4 is setup as a Proxy.
You register the phones to SP4.
The only change to SP1 is to route inbound calls to the phones.
The SP1 change is not required for outbound calls.
I gave you the basic credentials for the IP phones.
Use the OBi202's IP address instead of a proxy name.
Port 5063 is the default port for SP4.
If you don't have a separate field for the port, code the proxy name like 192.168.1.100:5063
I do have an OBi1032 IP phone.
The basic configuration is exactly like an OBi ATA.
This is the only IP phone I've ever owned, so I can't help anymore than the above.
Maybe someone else can help.
I have a suggestion.
If you have a Windows computer install the Phonerlite softphone.
It's very easy to setup.
Get it to work with the OBi202.
This way you will know the OBi202 is setup correctly.
Download and install:
http://www.phoner.de/PhonerLiteSetup.exeWhen you start Phonerlite I think wizard will popup because no accounts are defined.
Proxy: 192.168.1.100:5063
Click right arrow.
User Name: OBi202
Password OBi202PW
Click right arrow.
Change Profile Name: OBi202
Click check mark
You should have a green circle indicating you are registered.
Dial a number and click the green phone symbol.
Click red phone symbol to hang up.