Bug 833229 - 2.b/N: owning MozVoicemailStatus at client side.
Bug 833229 - 3.a/N: build voicemail by default.
Bug 833229 - 3.b/N: add voicemail IPDL protocol
Bug 833229 - 4/5: add VoicemailFactory for creating different voicemail services.
Bug 833229 - 5/5: implement GonkVoicemailService