Do not close media streams before negotiating it at the SIP level

Ignore-this: bb8a2bf9257cb40559c4285016173d3d

darcs-hash:20091127131738-b22ec-4cb9eb755e9b8187b4aff166e2e48fcd5b8d45cc
Added support for icon application

Ignore-this: c4be35556d52542812f82a9a73a2bfa8

darcs-hash:20091127144013-56b4d-4560ddae065d6369bd3d36a521f6ba868bb05f17