Obihai OBi100 Administration Manual page 26

Call Forward Numbers
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)
You may also set the call forward number to a phone port (ph, ph1 or ph2) or the AA (aa)
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