ANSI T1.401.04:2000 pdf download.Network to Customer Installation Interfaces一Analog Voicegrade Switched Access Lines with the Call Waiting, Distinctive Call Waiting, or Calling Identity Delivery on Call Waiting Feature.
ANSI T1.401.04 provides the requirements associated with three different types of call waiting supplemental features that may be used on analog voicegrade switched access lines with loop-start signaling. The three features are called:
– Call Waiting (CW);
• Distinctive Call Waiting (DCW);
– Calling Identity Delivery on Call Waiting (CIDCW).
This standard is intended to be used in conjunction with the following standards:
– American National Standard for Telecommunications – Interface between carriers and customer installations – Analog voice grade switched access lines using loop-start and ground-start signaling, Ti .401-1993;
– American National Standard for Telecommunications – Network to Customer Installation Interfaces
– Analog Voice grade Switched Access Lines with the Calling Number Deliveiy, Calling Name Delivery,
or Visual Message Waiting Indicator Feature, Ti .401.03-1998.
The CW feature provides a customer installation (Cl), that is off-hook during the communications state of an originating or terminating call, with a CW tone to alert the Cl that an incoming call is waiting to be answered. The Cl can place the current call on hold and answer the incoming call by generating a flash signal.
The DCW feature is provided on switched access lines that also have a supplemental feature that provides distinctive ringing patterns for some incoming calls. The DCW customer may specify a list of telephone numbers that will initiate the DCW feature when calls are received from those switched access lines. The DCW feature provides a Cl, that is off-hook during the communications state of an originating or terminating call, with a DCW tone pattern, If the call that is waiting to be answered is from a switched access line that matches a telephone number on the DCW list, to alert the Cl that an incoming call is waiting to be answered. The Cl can place the current call on hold and answer the incoming call by generating a flash signal.
The CIDCW feature is provided on switched access lines that have the CW or DCW feature and a Calling Identity Delivery feature such as the Calling Number Delivery feature or Calling Name Delivery feature, or both the Calling Number Delivery and Calling Name Delivery features. The CIDCW feature provides a Cl, that is off-hook during the communications state of an originating or terminating call, with a CW tone followed by a Cl Alerting Signal and a network-originated data message or a DCW tone pattern followed by a Cl Alerting Signal and a network-originated data message when an incoming call is waiting to be answered. The data message delivers the caller’s identity, that is, the caller’s number, the caller’s name, or the caller’s name and number. The Cl can place the current call on hold and answer the incoming call by generating a flash signal.ANSI T1.401.04 pdf download.