Sandra Busby from the Welsh Contact Centre Forum said that "even throughout the recession, this [call centre] industry has continued to grow."
She said that part of the reason for Welsh strength for call centres is communication issues experienced by customers calling overseas, and says that the new jobs are "absolutely vital" for Swansea and its economy.
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Gary Martin and his son Dale had plotted to throw drugs over the prison wall hidden in plastic egg-shaped containers.
Visitors to the centre can get a close-up look of the birds, which have been breeding in the area since 2004.
A public inquiry into undercover policing in England and Wales is to be formally opened today.