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
Newcastle United winger Rolando Aarons and his mother have been spared jail after admitting affray over a brawl in a Newcastle bar
The 20 year old was described as a promising young footballer. He died on Sunday morning during a holiday with his friends in the city.
M&S has today announced that stores in Darlington and Stockton could be at risk of closing, in a bid to reshape its UK store estate.