sipcmd
Examples
# call 101
./sipcmd -w 10.99.2.2 -u 100 -c 100 -p 5060 -P sip -x "c101"
# answer call
./sipcmd -w 10.99.2.2 -u 100 -c 100 -p 5060 -P sip -x "a"
# answer and wait 60 sec
./sipcmd -w 10.99.2.2 -u 100 -c 100 -p 5060 -P sip -x "a;w60000"