This story from Techdirt (a US site) actually surprised me - it turns out that the US has been increasing its total number of call centre workers even though its market share has declined:

Judging by stories in the media, you might think that India dominates the market for call centers, and we're probably a little guilty of feeding this perception as well. But the actual numbers paint a different picture; the US still dominates this space, as 62% of all global call center jobs are in the country. India's share is just 5%. And while the percentage has declined in the US, the net number of jobs has actually risen; in the past four years, the economy has created 183,000 new positions. It's not surprising that these numbers aren't often told. Layoffs make for a much better story than hiring. And while it's been noted plenty that Indian economic growth doesn't hurt our own economy, it's interesting that even this one specific industry isn't a zero-sum game.