Since you don't have a free SP, you need to use Phonerlite without registration. This setup assumes you want to route calls to GV defined on SP1. Use OBi Expert to make the config changes.
OBi202
Service Providers -> ITSP Profile B SIP -> X_SpoofCallerID: Checked
Above will pass callerid to Phonerlite
Voice Services -> SP2 Service -> X_InboundCallRoute:
{OBi202>(Msp1):sp1},{ph}
Above will route outbound calls to SP1
Voice Services -> SP1 Service -> X_InboundCallRoute:
ph,sp2(anything@192.168.1.100:5060)
Change 192.168.1.100 to the IP address of the computer running Phonerlite.
5060 is the Port number for Phonerlite
Above will route inbound calls to Phonerlite
Download and install Phonerlite:
http://www.phoner.de/PhonerLiteSetup.exeWhen you start Phonerlite I think a wizard will popup because no accounts are defined.
Proxy: 192.168.1.202:5061 (IP addr & Port of SP2 on the OBi202)
Click right arrow.
User Name: OBi202
Click right arrow.
Change Profile Name: OBi202
Click check mark
Uncheck box next to Register
Save
Dial a number and click the green phone symbol.
You can use the keyboard to dial a number.
Click red phone symbol to hang up.