Hi Folks:
I have been seeing this portal in a detailed way and also the Indian Call center scenario in a closer way, since our company is thinking of coming up with a partnered site in India or Pakistan, what your question wants is a composite answer and that I found on one site and you may also have a look at that, I really do not know how well they are offering but it may be worth asking, you can visit :
http://www.collaborateglobally.com/globaldialer.htm
There are quite a few, but this company seems to be serious from point 1 to finish, but again unless it is transaccted who knows how they are, but it seemed to be a reasonably composite sense of call center logics for a new party coming in the field.
Rich