I have got a hard one for you.
We have branches all over the world but only the HQ is Cisco IP Telephony. All other sites are Avaya. I am trying to convince the executifs to go VoIP world wide but they are asking me about the saving the solution will bring. They are paying an average of about 3 to 5 cents per minute. My question for you is; is there any accurate tool, document or sites that I can find the cost of calls per minutes from anywher to anywhere. I know it's a very hard request but it will help me to prove my point and hopfuly the starting of a world wide Cisco IP Telephony implementation (Over 20000 users). Please let me know if you can help.