Added some forgotten argument names to sip_session2.py

darcs-hash:20090422123137-58103-4b7bca167982299f402f38df08a395dc4255bf61
Fix for spurious pause time while playing tones in core

darcs-hash:20090422133041-58103-2e1f7fc0e4ab7efbd8f00c98f39e04b31742959d