SIP code property for NgnInviteEventArgs is not accessible

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What steps will reproduce the problem?
1. Send a message to a network that is not supported or anything that will make 
the app receive the MESSAGING_EVENT_FAILURE notification.

What is the expected output? What do you see instead?
SIP code can't be accessed from the NgnMessagingEventArgs object unlike in the 
NgnInviteEventArgs object. There is no property for it, only the SIP phrase. I 
tried getting it from the mExtra dictionary but the value is nil.

What version of the product or source code revision are you using? On what
operating system?
iOS 7.1.2, Xcode Version 6.0.1 (6A317)

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 13 Oct 2014 at 7:32