DTE<->DTE connection through RS232C(V.24)

Hello

I'm working on a networking equipment box project which has 3x V.24
ports.
In routine use , this box will comm. with 3 different USART devices.
(DTE<->DCE configuration)

But customer wants to connect two of our boxes to each other without
the need of a different cable and connector. (DTE<->DTE configuration)

If we were allowed to use null modem cable , there will be no problem
but since we are not allowed we must somehow change the pin
assignments.

Has any of you faced this kind of problem ? and what action you
take ?

Regards..

.

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