There is no sch procedures for the recruitments in BPO 
generaly all the BPO take the walk in interview. As far as 
the salary concern, there is no such parameters for salary 
generaly they provide between 7000 INR to 12000 INR this 
will be depend upon your capability.

the hiring procedures for Bpo sector should change like 
telephonoic  interview procedure and it should be helpfull 
for experienced persons also.and the salary parameters like 
frsher between 7000 to 12000 depends upon the candidate 
capability and the comapny status.

In bpo , the communication skills is must. If you dont have and if you manage then they will provide training.
In BPO, they will verify your management skills , way of talking, communication skills , vocablary, Grammer mistakes and sooo on.
If you are capable personality you can earn from 7000 to  40000 Rs based on the target you reach.
They will be day and nite shifts based on they requirment(this is not your choice).
More target more money. If it is wipro , Tcs, Hcl .. U can jump to IT Field also based on the requirement and most probably they prefer they working employ.. All the best