UNDO: sip_session: remove hard coded file names for sounds

darcs-hash:20090408083800-b2873-97633a3d58652db011e6d860232fc3518757c71c
sip_session: fix :trace sip/pjsip

- an attribute was set on GreenEngine but not on Engine

darcs-hash:20090415065336-b2873-3d1d612b6cacb785e23c1c52a64bdd8d750655ac