Some review comments for the branch:
* in PROP_STUN_SERVERS to create the ValueArray, use gabble_value_array_build, which will cut out 
   a   big chunk of code.
* For the test instead of assert X == Y, use the assertEquals method, which generated better error
   messages  on failure
* For the test, please factor out the Call specicif test into it's own test function. Also the code 
   that checks the result of the stun check, should just be a function as currently it jsut seems 
   copy/pasted.
* Also instead of doing,  assert stream_props['Transport'] == 2 # GTALK_P2P use a constant from 
  constants.py (if there isn't one for it, please add one)

Updated the branch per your review.

443dd549dfb24393975e7f345cb5f5540ff42313:
  assertEquals is (expected, value), not (value, expected).. which seems to catch everyone by surprise.

Updated the branch per your review.

Merged, thanks