Inaudibly notifying a caller of a status of an open-line call

A system comprising:

• at least one hardware processor;
• and
• at least one non-transitory memory storing instructions, which, when executed by the at least one hardware processor, cause the system to:
• receive at a UE of a callee, a session initiation protocol (SIP) call from a UE associated with a caller,
• wherein the SIP call includes multiple fields, and
• wherein a field among the multiple fields indicates that the SIP call is an open-line call;
• receive a first indication that the UE associated with the callee has generated a notification to the callee;
• upon identifying the SIP call as the open-line call and receiving the first indication, send a first message to a UE associated with the caller that the UE associated with the callee received the SIP call,
• wherein the first message indicates to the UE associated with the caller to generate a first inaudible notification indicating that the UE associated with the callee received the SIP call;
• receive a second indication that the callee has answered the SIP call;
• and
• upon identifying the SIP call as the open-line call and receiving the second indication, send a second message to the UE associated with the caller that the callee has answered the SIP call,
• wherein the second message indicates to the UE associated with the caller to generate a second inaudible notification indicating that the callee has answered the SIP call.

A system comprising:

• at least one hardware processor;
• and
• at least one non-transitory memory storing instructions, which, when executed by the at least one hardware processor, cause the system to:
• at a UE associated with a caller receive a predetermined input from the caller indicating to place an open-line call,
• wherein the predetermined input is configured to unlikely be dialed by accident, and
• wherein the predetermined input includes at least two of:
• a predetermined press of one or more buttons, a predetermined gesture, a voice command, or holding one or more buttons for a predetermined amount of time;
• and
• determine whether the SIP call is the open-line call by calculating a likelihood threshold associated with the predetermined input;
• place a SIP call indicating that the SIP call is the open-line call;
• upon receiving the predetermined input, configure the UE to convert incoming audible notifications to an inaudible notification;
• receive a first message indicating that the UE associated with the callee generated a notification of the SIP call to the callee;
• based on the first message, generate a first inaudible notification, receive a second message indicating that the callee has answered the SIP call;
• and
• based on the second message, generate a second inaudible notification, wherein the second inaudible notification is different from the first inaudible notification.