Telecom Equipment maker Avaya Inc AVXX.UL said it signed a deal to buy Israeli video conferencing company Radvision (RVSN.TA) for $230 million. The deal, which has been approved by both companies' boards, is expected to close in 90 days, Avaya said in a statement.

Radvision (RVSN.O) shareholders will receive $11.85 per share, a 57 percent premium to Radvision's average closing price in the previous 90 days.

The company has faced difficulties in the past two years after Cisco Systems (CSCO.O), previously its largest customer, acquired Radvision's Norwegian rival Tandberg.

Speculation of a deal had pushed Radvision's Nasdaq-listed shares up 11 percent on 3/13/12 and another 12.3 percent on 3/14/12 to $11.20, boosting its market value to above $200 million.

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