C.2.8 Line selection +VLS

27.0073GPPAT command set for User Equipment (UE)Release 18TS

This determines the selection of sources and destinations of audio samples. An integer is used to label a particular combination of sources and destinations. The integer is defined in an entry in IS‑101 which assumes as a model a TA, a local phone and a phone line. Two additional "manufacturer specific" configurations (16,17) are defined.

‑ label=0: this is the idle state ‑ the phone is not connected to the radio network and no audio paths are used.

‑ label=1: the phone is connected to the radio network and no audio paths involving the internal microphone or internal loudspeaker are selected. This allows the computer to transmit audio data over the radio transmitter by selecting "transmit mode":

Table C.8: +VLS label 1a

	loudspeaker	computer i/p	transmit stage
microphone ‑‑>
computer o/p ‑‑>			*
receiver stage ‑‑>

This also allows the computer to receive audio data from the radio receiver by selecting "receive mode":

Table C.9: +VLS label 1b

	loudspeaker	computer i/p	transmit stage
microphone ‑‑>
computer o/p ‑‑>
receiver stage ‑‑>		*

‑ label=4: the phone is not connected to the radio network but there is an audio path to the internal speaker. This allows the computer to play sound by selecting "transmit mode".

Table C.10: +VLS label 4

	loudspeaker	computer i/p	transmit stage
microphone ‑‑>
computer o/p ‑‑>	*
receiver stage ‑‑>

‑ label=6: the phone is not connected to the radio network but there is an audio path to the internal microphone. This allows the computer to record sound by selecting "receive mode".

Table C.11: +VLS label 6

	loudspeaker	computer i/p	transmit stage
microphone ‑‑>		*
computer o/p ‑‑>
receiver stage ‑‑>

‑ label=7: the phone is connected to the radio network. The internal microphone is connected to the radio transmitter. The radio receiver is connected to the internal loudspeaker. This allows the computer to enable normal phone operation (a human holding a conversation) by selecting command mode.

Table C.12: +VLS label 7

	loudspeaker	computer i/p	transmit stage
microphone ‑‑>			*
computer o/p ‑‑>
receiver stage ‑‑>	*

Table C.13: +VLS parameter command syntax

Command	Return
+VLS=<n>	+VCON
+VLS?	<n>
+VLS=?	complex; refer IS‑101

+VCON is returned if an audio path is established or if a connection is made to the radio network.

Manufacturer specific extension (reserved as such by IS‑101)

‑ label=16: the phone is connected to the radio network. There is a path to the internal microphone, which is also connected to the radio transmitter. There is a path to the radio receiver, which is also connected to the internal loudspeaker. This allows the computer to record the sum of transmitted and received audio by selecting "receive mode".

Table C.14: +VLS label 16

	loudspeaker	computer i/p	transmit stage
microphone ‑‑>		*	*
computer o/p ‑‑>
receiver stage ‑‑>	*	*

‑ label=17: the phone is connected to the radio system and there is a path to the internal loudspeaker and to the radio transmitter. This allows the computer to simultaneously play sound and send audio over the radio by selecting "transmit mode".

Table C.15: +VLS label 17

	loudspeaker	computer i/p	transmit stage
microphone ‑‑>
computer o/p ‑‑>	*		*
receiver stage ‑‑>