User guide

Developers guidelines | AT commands
103 June 2010
AT+CHSU HSCSD automatic user-initiated upgrade
Intermediate result codes
+CHSR HSCSD parameters report result code
Description: Controls whether or not automatic user initiated service level upgrading
will be used for non-transparent HSCSD calls. “Automatic” means that, if
enabled, the ME/TA will use the UP bit in the received RLP frames to
determine when to initiate user initiated service level upgrading (that is,
when to modify the +CHSN parameters <wAiur> and/or <wRx> for the
current call). Refer to GSM 07.01 for details on the interpretation of the UP
bit(s).
Note: The validity of the UP bit in the RLP frames depends on the result of
the RLP negotiations. The UP bit will only be used if the result of the RLP
negotiations were successful with respect to the UP bit.
Set command: AT+CHSU=[<mode>]
Read command: AT+CHSU? Displays the current <mode> setting.
Test command: AT+CHSU=? Shows if the command is supported.
Test command
response: +CHSU: (list of supported <mode>s)
Parameter:
<mode>:
<mode> Description
0 Disable use of UP bit for upgrading
1 Enable use of UP bit for upgrading. Default value
Description: When enabled by using the AT+CHSR command, this intermediate result
code is transmitted at the point of call setup negotiation where the phone
has determined what type of HSCSD connection will be used.
Intermediate result
code: AT+CHSR: <rx>, <tx>,<auir>,<coding>
Parameters: See AT+CHSC.