Forwarding incoming LINE callerID to Callcentric

I have an AT&T landline going into the Line port on an Obi110 which has a phone number of 847-555-1212. I have X-Spoof enabled and the number 847-555-1212 entered as the Caller_Name, and so calls originated from the Obi110 using Callcentric (which is SP2 in my setup) show 847-555-1212 as the callerID to anyone receiving the call.

I also forward all calls coming in on the Line port to a cell phone 708-555-1212. I do this with an inbound call route on the line port of {PH, SP2(17085551212)}. This rings the call on the phone port and on the cell. Great so far.

I would like to have the callerID of the incoming call show on the cell phone instead of the spoofed callerID of the actual AT&T line. This way I will know on the cell who is calling, not just that it is being forwarded from the Obi110.

I tried the following for incoming call routes to do this, with no success so far:

{PH, SP2($1>17085551212)} according to the Data Admin Guide, $1 represents the incoming ID

{PH, SP2(incoming_caller)>(17085551212)} a support email from Obihai used the incoming_caller as representation of the incoming callerID. Not sure if I interpreted that correctly.

{PH, (($1)>(17085551212)):SP2} putting :SP2 at the end was another suggestion of Obihai support.

So far no success. With the format {PH, SP2(17085551212), both the phone and the cell ring just as desired, but adding more to this string keeps it from working at all, at least with what I have tried.

I would appreciate any suggestions from someone who has successfully forwarded incoming callerID to Callcentric. Callcentric said that that can accept it in the "In-Reply_To" header, wherever that is in the Obi110.