ACC X.25 Protocol User's Guide

X.25 Status and Completion Messages
Introduction
Appendix A 131
contains buffer completion status for
a write request (zsend). Usually, this
indicates an error condition.
mhdp->m id .mz srce.zlu will contain the ZLU number of the
X.25 link or Virtual Circuit the status
message is associated with.
mhdp->m rq .mr qstat will contain one of the status codes
listed below in the lower seven bits of
the field (e.g. bits 0-6).