Requests that the NPI application be unbound from the network address.
This primitive consists of one M_PROTO message block with the following structure:
typedef struct {
   ulong PRIM_type; 
}N_unbind_req_t;
The N_UNBIND_REQ primitive requests that the NPI unbinds the application that was previously bound to the network address.
| PRIM_type | Specifies the N_UNBIND_REQ primitive. | 
NPI can generate the following acknowledgments upon receipt of the primitive:
| Successful | The N_OK_ACK primitive acknowledges that the N_UNBIND_REQ primitive successfully completed. | 
| Unsuccessful | The N_ERROR_ACK primitive indicates non-fatal errors. | 
The applicable non-fatal errors are as follows:
| NOUTSTATE | Indicates the primitive was issued from an invalid state. | 
| NSYSERR | Indicates a system error. The error is indicated in the N_ERROR_ACK primitive. | 
This primitive is part of X.25 Licensed Program.