Design Problem #2 You have been hired by an unknown entity to put in a PBX for their new office. They tell you that there will be 1500 people who work there, and it’s a pretty conventional white collar working environment. The customer’s IT department is run by someone who is risk adverse and quasi-autistic (e.g., a conventional IT manager); he has been sold an IP-PBX by Cicso because it’s safe “nobody has ever been fired buying Cisco” and because it requires someone from IT to manage it (job security). Cisco, in turn, has requested a SIP trunk rather than a channelized DS1 trunk. If the customer wants to use G711, with 20 ms packet lengths: • How many trunk circuits are necessary ? • Do you want redundancy – if so, how? • How many carriers are you going to use ? • How much will this cost roughly ? The customer has decided he wants to us G722 with 10 ms packet lengths. How may trunk circuits do you need now?