call history shows calls are only delivered to the phone port.
Are you entering your forwarding number in the correct format.
There is one set of Call Forward Settings per voice service on the OBi, such that the settings apply to incoming calls on that service only. However calls may be forwarded to numbers on the same service or on another service. Therefore each call forward number stored in the OBi configuration MUST include call routing information to let the device know which voice service should be used to forward the call to. The general format of a call forward number is:
TK(number)
Note: TK is the abbreviated name of a voice service.
Valid values of TK are SP1 for the SP1 Voice Service (with ITSP A or B), SP2 for the SP2 Voice Service (with ITSP A or B), LI1 for the PSTN service (on the LINE Port), or PP1 for the OBiTALK Service.
The number to forward to must be in the final form that is acceptable by the service provider. OBi will not apply any Digit Map or Call Routing Rules on it.
Examples: SP1(14089991234), PP1(ob200333456)