What is Initial Address Message IAM ?
Rating: +2
IAM or Initial Address Message is the first message sent in a call set-up by a Switch or Exchange to other partner exchange. IAM seizes / reserves a circuit between the exchanges for the call and contains the information of numbers dialed by the calling party.
Other important information contained in an IAM message includes
• Originating Point Code OPC
• Destination Point Code DPC
• Circuit Identification Code CIC
• Calling party number
• Transmission medium requirement (echo suppresser status etc).