Firstsource has confirmed that 300 of the jobs it's proposing to axe are permanent positions.
In all, 542 jobs are at risk. The remainder are contract roles.
The firm has also confirmed that the job losses will be spread evenly across two sites: its Massey Road operation at Barclaycard's offices in Thornaby, and at its own base at Fountain Court in Middlesbrough.
The job losses are in response to falling demand for Payment Protection Insurance claims handling from Firstsource's client, Barclaycard.
More top news
Four Kookaburra chicks have hatched at Kirkleatham Owl Centre in Redcar
Sunday nig.ht's Forecast
Police have seized 539 units of alcohol from drinkers as young as 15 in a bid to crack down on underage bingeing.