DRESPL

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   .-DRESPL--=--NALLOW-----.   
>>-+-----------------------+-----------------------------------><
   |            .-NALLOW-. |   
   '-DRESPL--=--+--------+-'   
                '-ALLOW--'     

Specifies whether the local application program (local logical unit) will deactivate sessions on receipt of a CNOS request that specifies the application program as the responsible logical unit.

See z/OS Communications Server: SNA Programmer's LU 6.2 Guide for an explanation of draining.
DRESPL=ALLOW
Allows the application program to deactivate sessions. The value indicating the responsible LU in the reserved CNOS is not negotiated.
DRESPL=NALLOW
Does not allow the application program to deactivate sessions. Instead, VTAM® assigns the responsibility for deactivating sessions to the remote logical unit that sent the CNOS request.