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A mobile-focused, phone number-based model operates on the concept of primary and secondary devices. Examples of such messaging services include: WhatsApp , Viber , Line , WeChat , Signal , etc. The primary device is a mobile phone and is required to login and send/receive messages.
A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call. The busy signal has become less common in the past few decades due to the prevalence of call waiting and voicemail.
Telecommunication equipment such as fax machines and modems are designed to recognize certain tones, such as dial tone and busy tone. The ITU-T E.180 and E.182 recommendations define the technical characteristics and intended usage of some of these tones. ToneScript is a tone description format that may be used to specify the tone.
Open Whisper Systems (abbreviated OWS [7]) was a software development group [8] that was founded by Moxie Marlinspike in 2013. The group picked up the open source development of TextSecure and RedPhone, and was later responsible for starting the development of the Signal Protocol [9] and the Signal messaging app.
Dialing *70 can prevent the call from completing when the phone line does not have the call waiting feature active. Leave this option unchecked if you are no longer able to connect. 3. Check or uncheck, “I have to dial this number to reach an outside line” depending on your telephone line. Normally, this should not be selected.
The reorder tone, also known as the fast busy tone, or the congestion tone, or all trunks busy (ATB) tone is an audible call progress tone in the public switched telephone network (PSTN) that is returned to a calling party to indicate that the call cannot be processed through the network.
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The Signal applications on Android and iOS can be locked with the phone's pin, passphrase, or biometric authentication. [126] The user can define a "screen lock timeout" interval, where Signal will re-encrypt the messages after a certain amount of time, providing an additional protection mechanism in case the phone is lost or stolen. [123] [126]