[voicecall] Apply the same fix in d7ef2a2f36cabbff5fee35a123ba75cbf936794e to the ofono handler.
[voicecall] Apply the same fix as a1a7abf4ffa509f1fb332ca6bac660043db939bd to the ofono handler.
Merge pull request #41 from rburchell/master

Sync fixes from Telepathy handler to Ofono.