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
Mostly cloudy, some bright spells, rain on and off and blustery. Milder temperatures than on Saturday
Goals from Patrick Bamford and Kike Middlesbrough as they saw off an out-of-sorts Manchester City at the Eithad.
Flowers have been laid at Framwellgate Bridge for Euan Coulthard, Sope Peters and Luke Pearce who lost their lives in Durham's River Wear