Siemens TC63 Command Set page 264

TC63 AT Command Set
10.6 AT^SISW
(num)
<urcCauseId>
Indicates whether or not data are available for transfer with AT^SISW.
0
1
2
TC63_ATC_V00.490
Confidential / Draft - Do not copy
No data available for writing with AT^SISW.
New data can be written via AT^SISW.
In the case of Socket, FTP download, HTTP: Data transfer has been finished
and Internet service can be closed via AT^SISC.
In the case of FTP upload and SMTP: To indicate successful transmission, the
URC "^SISW: x,2" is sent after the service was gracefully closed. If the FTP
upload or SMTP service is closed immediately the URC will not be sent.
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