NAT traversal ICE update offeranswer

Version 2 (Anonymous, 04/19/2012 03:30 pm)

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Test and fix ICE negotiation:
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* Make Session send re-INVITE after successful ICE negotation if needed The re-INVITE will only be sent if the resulting candidate of the negotation is different than the one previously sent int the c= line.
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* Added ice_active an corresponding notification to RTPTransport
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* Use ice in bonjour account