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Hold–UUS3 Interaction Disclosure Number: IPCOM000011882D
Original Publication Date: 2003-Apr-25
Included in the Prior Art Database: 2003-Apr-25

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This invention applies for the telecommunications field and refers to the usage of a specific feature called “User to User Signaling number 3” (UUS3) and its interaction with “Call Hold” (CH) and “Call Waiting” (CW) features. UUS3 feature is used for ISDN (Integrated Service Digital Network) telephony users who wish to inform other users about something by using their ISDN device’s pushbuttons and without using voice (limited data transfer using an established telephony connection). This exchange of non-voice information is done through D-channel signalling. Hold feature is used for ISDN telephony users who wish to put a user of an established connection on standby mode (speech communication is disrupted) and then establish a second connection to another telephony user. Call Waiting is used for ISDN telephony users who wish to get notified about an incoming call when they have already establish a connection with another user and have the possibility to establish a second connection by putting the first connection on standby mode. Until now, the interaction of UUS3 with CH and UUS3 with CW features is not applicable. For the first case this means that whenever an ISDN telephony user puts another user on hold (on standby mode) then the user which is put on standby mode cannot use UUS3 to send to the Hold served user the information he desires to send. Similarly, nor the Hold served user can use UUS3 feature to send to the standby user any information.