Avaya Inc on Thursday said it has signed an agreement to acquire RADVISION Ltd, which provides video conferencing and telepresence technologies over IP and wireless networks, in an estimated $230 million deal. In the transaction, which has been approved by both the company's Board of Directors, RADVISION shareholders will receive $11.85 per share, valuing the transaction at approximately $230 million. The acquisition is expected to close within approximately 90 days assuming the satisfaction of agreed-upon closing conditions.