The value of tmnxAncpStrInfMultSvcSiteCust indicates, together with
the object tmnxAncpStrInfMultSvcSiteName the MSS site to which the
ANCP-string defined in tmnxAncpStrInfAncpString is associated.
The value of this object is only meaningful when the value of the
object tmnxAncpStrInfAssociation is set to multiServSite(3).