In order to make it possible to suppress increase in the cost of message retransmission, this message delivery device delivers a message, stores a history relating to the success or failure of the delivery to each of destinations of the message in a history storage unit, when the delivery of the message has failed, determines on the basis of the history whether to perform retransmission of the message, and when determining to perform the retransmission, performs the retransmission of the message.

A group pairing method of a wireless intercom system according to an aspect includes: scanning, by a mobile device wirelessly connected to a master wireless intercom device, QR codes displayed on mobile devices respectively wirelessly connected to a plurality of slave wireless intercom devices to add the plurality of slave wireless intercom devices to an intercom group as members (‘intercom group members’); setting a connection order of the intercom group members by using the mobile device wirelessly connected to the master wireless intercom device; and wirelessly chain-connecting the plurality of slave wireless intercom devices to the master wireless intercom device according to the set connection order.

Provided is a control method for a notification system including a notification device located inside a building. The control method includes: (a) obtaining face information of a deliverer of an article from an outside server; (b) obtaining a camera image of a face of a visitor to the building, the camera image being captured by a camera disposed outside the building; (c) verifying whether the visitor is the deliverer by comparing the face information and the camera image; and (d) when the visitor is verified to be the deliverer, notifying, by the notification device, a user of delivery information indicating that the deliverer of the article has arrived at the building.

An acoustic processing method includes extracting a feature amount from a first audio signal representing sound collected by a microphone, receiving a second audio signal from a different device on a far-end side, determining a gain of the second audio signal based on the extracted feature amount, and adjusting the second audio signal based on the determined gain of the second audio signal.

An electronic device is provided. The electronic device includes a housing including an opening defined on at least one surface of the housing, a socket adjacent to the opening in the housing, a tray insertable into the socket through the opening and configured to hold one or more cards, a battery, a power management circuit configured to control power provided from the battery, and a first terminal connected to the power management circuit, the first terminal included in the socket, wherein the power management module is configured to control a provision of power from the battery to at least one internal component of the electronic device based on a first signal detected via the first terminal.

Systems and methods for operating a multi-channel intercom system for audio communications between users, with reduced crosstalk, are disclosed. Exemplary implementations may: receive, by a first user station, a modulation carrier signal; capture a first audio signal from a first user, wherein the first audio signal has a first phase; at a rate based on the modulation carrier signal, invert the first phase of the first audio signal to generate a phase-flipped audio signal; transfer the phase-flipped audio signal to a second user station; at a second rate based on the modulation carrier signal, invert a phase of the phase-flipped audio signal to generate an intermediate audio signal; and present a second audio signal based on the intermediate audio signal to the second user.

Systems and methods for volume control over intercom trunk lines. One example method includes receiving, from a first keypanel coupled to a first intercom, a call request identifying a remote keypanel coupled to a second intercom. The method includes transmitting a trunk request based on the call request and receiving a trunk setup message. The method includes activating a first crosspoint to provide a two-way audio connection between the first and second intercom devices. The method includes applying a trunk gain value to the first crosspoint based on the remote keypanel and transmitting, with an audio gain based on the trunk gain value, an audio stream received from the first keypanel. The method includes receiving, from the second intercom, a gain adjustment value associated with the first keypanel and the remote keypanel and applying an adjusted trunk gain value to the first crosspoint based on the gain adjustment value.

Systems and methods for volume control over intercom trunk lines. One example method includes receiving, from a first keypanel coupled to a first intercom, a call request identifying a remote keypanel coupled to a second intercom. The method includes transmitting a trunk request based on the call request and receiving a trunk setup message. The method includes activating a first crosspoint to provide a two-way audio connection between the first and second intercom devices. The method includes applying a trunk gain value to the first crosspoint based on the remote keypanel and transmitting, with an audio gain based on the trunk gain value, an audio stream received from the first keypanel. The method includes receiving, from the second intercom, a gain adjustment value associated with the first keypanel and the remote keypanel and applying an adjusted trunk gain value to the first crosspoint based on the gain adjustment value.

In some embodiments, the present invention provides for a computer-implemented method, including: causing, by a specifically programmed computer call management communication system, to transform, over a computer network, computing devices of users, into corresponding specialized call management devices, by having each computing device to execute a specialized call management client software application being in electronic communication with the specifically programmed computer call management communication system over the computer network by utilizing SIP; where the specialized call management client software application generates specialized graphical user interfaces configured to allow each user to concurrently initiate and maintain, over the computer network, a plurality of voice communications of distinct types with other users, by, for example, allowing each user to independently and dynamically divert, in real-time, any voice communication of any type to any audio device associated with a corresponding specialized call management device of such user.

In some embodiments, the present invention provides for a computer-implemented method, including: causing, by a specifically programmed computer call management communication system, to transform, over a computer network, computing devices of users, into corresponding specialized call management devices, by having each computing device to execute a specialized call management client software application being in electronic communication with the specifically programmed computer call management communication system over the computer network by utilizing SIP; where the specialized call management client software application generates specialized graphical user interfaces configured to allow each user to concurrently initiate and maintain, over the computer network, a plurality of voice communications of distinct types with other users, by, for example, allowing each user to independently and dynamically divert, in real-time, any voice communication of any type to any audio device associated with a corresponding specialized call management device of such user.