Modified AudioStream to support changing the rtp port in reINVITEs

Ignore-this: a84d1e7d015f16f5e65f783cb102b1d8

darcs-hash:20100104105849-1e3d8-149040f81cf432af165961b2adeaefb18dd6cc2c
Modified audio scripts to display RTP parameters changes

Ignore-this: fe7fb4c8ec7cf60e2189b5ec693c4891

darcs-hash:20100104110953-1e3d8-8209095d4adf640127bccc399e3c4b7e9a9f9079