CME GPP-3 Spécifications télécharger pdf (Page 151)

3GPP

3GPP TS 27.007 V6.3.0 (2003-

06)

Release 6

Annex C (informative):

Commands from TIA IS-101

C.1 Introduction

The "Voice Control Interim Standard for Asynchronous DCE", TIA IS-101, contains some commands that are useful

when passing audio "data" (that is, data which represents audio information) between the computer and the TA.

Some of the following subclauses describe commands from IS-101 which are central to this TA application. However,

with the exception of necessary extensions, these descriptions are not intended to replace the definitions found in

IS-101. Other novel commands from the interim standard are not included because they are peripheral to TA operation.

NOTE 1: IS-101 also uses V.250 [14] AT commands, but these are not mentioned here.

The standard specifies the following modes:

- command mode, where there is no transfer of audio "data" between the TA and the computer. In command mode,

the computer is neither sending audio data to the TA nor receiving audio data from the TA.

- transmit mode, where audio "data" is being transferred from the computer to the TA. No audio "data" is

transferred from the TA to the computer in this state. A transition back to command mode occurs when an

embedded command indicates "end of play" or "flush data", or an inactivity timer times out.

- receive mode, where audio "data" is being transferred from the TA to the computer. No audio "data" is

transferred from the computer to the TA in this state. A transition back to command mode occurs when any

command is sent from the computer, or an inactivity timer times out. During the receive mode, the TA embeds

result codes into the audio "data". These result codes indicate pertanent events such as "silence detected", "busy

detected", and so on.

Strictly, the standard specifies another mode (translation), but this is not directly of interest here.

NOTE 2: The TA "knows" the type of an incoming call (whether it is voice, data, fax, whatever), and certain POTS

events cannot occur. Hence some standard result codes for indication of events and discrimination of call

type are unnecessary.

There are three possible levels of service:

- a TA supporting level A performs the following operations and detects the following events: audio transmit,

audio receive, DTMF detection, DTMF generation and single tone generation. The following indications are

supported:

Event

Description

Handset state

3 ring idle

4 DTMF received idle

5 receive buffer overrun receive

6 unsolicited fax request idle

8 phone on/off hook idle

9 presumed hangup receive

10 presumed end of message receive

18 ringback idle

19 busy idle

23 playback buffer underrun transmit

25 fax or data request acknowledged idle

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CME GPP-3 Spécifications Page 151

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