#15 Fixes incoming call changing state to ????

[Anonymous]

Incoming calls that appear as ringing immediately
change state to ???? (as shown in iaxComm). Digging
into iaxclient I found that a piece of code
responding to the IAX_EVENT_VOICE event actually
removes the ringing flag from the call, effectively
making the call unanswerable from iaxComm. This
happens immediately after the call starts ringing.

I have to admit I'm not sure what IAX_EVENT_VOICE is
for (at first blush, perhaps monitoring call progress
stages?) but I simply commented out the offending
code to make calls answerable again through iaxComm.
Here is the patch.

[Nobody/Anonymous]

Keeps ringing flag from being removed for incoming calls

[GeneG1]

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