Integrated Services Digital Network (ISDN); Definition and Usage of Cause and Location in Digital Subscriber Signalling System No. One (DSS1) and Signalling System No. 7 ISDN User Part (ISUP) (ITU-T Recommendation Q.850 (05/98) with Addendum Modified; V1.
Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Services and Protocols for Advanced Networks (SPAN).