IMS: Conference changes

CL is handling refer failure for -
- held call in 3 way merge
- active call in 3 way merge
- active call in 4 way merge

Bug: 20224516, 20232100
Change-Id: I69a006cdedf705762d8494d0da6796884c8631a2
2 files changed
tree: c612c28f673f9885c811335e97aa48d930091cf7
  1. src/
  2. Android.mk
  3. CleanSpec.mk
  4. README.txt