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pcapsipdump is libpcap-based SIP sniffer with per-call sorting capabilities. It writes SIP/RTP sessions to disk in a same format, as "tcpdump -w", but one file per SIP session (even if there is thousands of concurrent SIP sessions).
Getting started: http://pcapsipdump.sf.net/
AT commands as input are sent to modem and responses given as output.
...Each command will be send to the modem, and all the response
for the command will be output to file (or stdout).
Example, to hang up any ongoing call:
$ echo ATH | atinout - /dev/ttyACM0 -
ATH
OK
$