INTERNATIONAL TELECOMMUNICATION UNION ITU-T RECOMMENDATION SUMMARY Rec. No. : E.331 Title : Minimum user-terminal interface for a human user entering address information into an ISDN terminal Study Group : II - Network Operation Version : New Date of adoption : 1991 Notes : Recommendation E.331 is intended to achieve a degree of world-wide uniformity in the basic procedure for a human user inputting address information such as destination numbers to an ISDN terminal. It is desirable for a user employing these basic procedures to be able to establish an ISDN connection using any ISDN terminal without requiring specific knowledge about the characteristics of that terminal. It is intended to cover the long-term requirements rather than to meet intermediate, change-over needs. It provides for the same procedure for the two kinds of signalling: functional (en bloc) signalling between the terminal and the network, and stimulus (overlap) signalling between the user and the network (as in the PSTN). To order the complete text of this Recommendation, please use the Order Form for ITU-T Recommendations. An electronic version of this form is available on ITUDOC (Winword: UPI=ITU-5265; ASCII: UPI=ITU-2488).