Chan_ss7 transfer of called numbers

Recently, chan_ss7 was used in the Signaling connection with a certain carrier. The business is the 400 transfer service. The carrier requested to pass the original called number. Otherwise, they may be unable to charge fees, so the call is prohibited. Invalid business negotiation, but I tried all the parameter configurations and could not pass the parameter. Later I debugged the source code of chan_ss7 and found the problem.Source codeSolve the problem after compilation.

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