如何使用 sipsak 来模拟呼叫，以便有实际的铃声，甚至可能播放声音？
thufir@mordor:~$
thufir@mordor:~$ sudo sipsak -v --usrloc-mode --from sip:demo_alice@localhost --password 123 --sip-uri sip:thufir@localhost
warning: ignoring -i option when in usrloc mode
All usrloc tests completed successful.
received last message 11.150 ms after first request (test duration).
thufir@mordor:~$