I have a client that is looking to change out an Avaya PBX running their call center. They average 100 agents and seasonally run up to 400 agents. They are looking to retire the Avaya due to cost and maintenance issues. Their renewal costs are coming due. 
Are there any recommendations from the forum as to a path to take for them. Can Asterisk/PiaF handle a call center reliably for this customer. The call center and the Internet are their lifeline.
Thanks in advance!
TomS

Are there any recommendations from the forum as to a path to take for them. Can Asterisk/PiaF handle a call center reliably for this customer. The call center and the Internet are their lifeline.
Thanks in advance!
TomS