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For data communication, the overall length of time required to establish a circuit-switched call between terminals; i.e., the time from the initiation of a call request to the beginning of the call message. Note: Call set-up time is the summation of: (a) call request time—the time from initiation of a calling signal to the delivery to the ...
Answering calls is usually done with either the AT+VLS=n or AT#VLS=n commands, where n is a number representing the modem's mode. For the vast majority of modems, this number will be 1 to answer a telephone call, and 0 to hang up; other numbers activate other functionality when present, such as speakerphone.
Voice over Long-Term Evolution (acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [ 1 ] [ 2 ] VoLTE has up to three times more voice [ 3 ] and data capacity than older 3G UMTS and up to six times more than 2G GSM .
Caller ID display; Call transfer and call hold; Dialing using name/ID (differs from speed dial in that no number is stored on the client) Locally stored and network-based directories; Conference calling and multiparty calls; Call park; Call blocking feature. Support for multiple VoIP accounts – the phone may register with more than one VoIP ...
For call setup, the body of a SIP message contains a Session Description Protocol (SDP) data unit, which specifies the media format, codec and media communication protocol. Voice and video media streams are typically carried between the terminals using the Real-time Transport Protocol (RTP) or Secure Real-time Transport Protocol (SRTP). [3] [8]
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Once a mobile phone has successfully attached to a GSM network as described above, calls may be made from the phone to any other phone on the global Public Switched Telephone Network. The user dials the telephone number , presses the send or talk key, and the mobile phone sends a call setup request message to the mobile phone network via the ...
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