Saying it’s seeing a decline in customer call volume, Altice USA today confirmed that it is laying off 600 workers in Connecticut, including workers at a call center in Shelton and an office in Stratford.

Melville-based Altice USA, part of Netherlands-based Altice, isn’t cutting back jobs at its News12 station in Norwalk, Connecticut.

The firm indicated it is moving customer call center work to Long Island, New Jersey and the Bronx as it consolidates centers.

Altice USA said the firm had invested in Optimum products and services, “making them more reliable” and reducing the number of customer service people required.

“We have seen a significant improvement in customer call volume and patterns,” Altice USA said in a written statement. “As we look to strengthen our operations in the nation’s most competitive market, we are aligning our contact center organization to meet the current needs of our customers.”

Altice told New York and New Jersey regulators that it wouldn’t lay off customer-facing employees for four years, but made no such agreement in Connecticut.

Employees who are affected will receive severance and outplacement support. They are also eligible to apply for other positions at the company.

Altice described its second quarter in 2016 for Optimum as the “strongest operational performance” since that quarter in 2012.

The firm said it added 19,000 Optimum customers in the second quarter and is on track to deliver 300 megabits per second broadband speeds to its entire footprint by 2017.

Altice on June 21 closed on the acquisition of Cablevision Systems, which along with its Suddenlink operations makes it the fourth biggest cable operator in the nation with more than 4.6 million customers in 20 states.

Altice USA on July 7 announced that an entity led by Patrick Dolan had acquired 75 percent of Newsday Media Group, while Altice retains a 25 percent stake in the company.

Read more about the acquisition of Cablevision here