name: ACKNOWLEDGE
full_form: Acknowledgement
context: A user may cause a DTMF tone to be generated e.g. by depression of a key in the mobile station. The relevant action is interpreted by the mobile station as a requirement for a DTMF digit to be sent in a START DTMF message on an established FACCH. This message contains the value of the digit to be transmitted (0, 1, ..., 9, A, B, C, D, *, #). Only a single digit will be transferred in each START DTMF message. On sending a START DTMF message the MS shall start timer T336. Where a previous START DTMF message has been sent, another START DTMF message shall only be sent by the MS following receipt of its STOP DTMF ACKNOWLEDGE message (see subclause 5.5.7.4) or a START DTMF REJECT message from the network (see subclause 5.5.7.2) or following the expiry of timers T336 and T337. If timer T336 expires, the MS shall terminate the ongoing DTMF procedure without any retransmissions, and is free to begin another DTMF procedure (e.g. another START DTMF message).
description: The ACKNOWLEDGE message in the context of DTMF procedures is a response from the network to the mobile station, indicating that it has received and processed the previous START DTMF message. This acknowledgement allows the mobile station to proceed with sending another START DTMF message or terminate the ongoing DTMF procedure.
explanation: ACKNOWLEDGE is classified as a Message because it represents a specific signaling data exchanged between the network and the mobile station, serving as a confirmation of the receipt and processing of the previous START DTMF message. This classification aligns with the context provided in the 3GPP TS 24.008 specification regarding the mobile radio interface layer 3 protocol.
section_title: 5.5.7.1 Start DTMF request by the mobile station
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