Israel’s largest operator Cellcom may file a liquidation request against Golan Telecom, it said in a statement.

Cellcom said it has already initiated legal proceedings, which it will continue, and is now mulling additional measures, including the liquidation request.

The action follows a demand from Cellcom that Golan pay ILS600 million ($155 million) for national roaming services.

“Cellcom cannot estimate the timing of such legal proceedings, what the decision in such proceedings will be, or their impact on the Company’s ability to collect amounts owed by Golan or to generate future revenues from Golan,” it said in a statement.

In the same statement, Cellcom said it is “in advanced negotiations” for a possible network sharing agreement with an unnamed third party interested in the purchase of Golan Telecom. Such an agreement would enable it to resolve its differences with Golan.

Cellcom issued a caveat about being unable to estimate the timing and results of any of the above mentioned negotiations, and whether they will mature into agreements, and whether these agreements will be approved by the regulators.