There should be one and only one IAM per call, regardless of direction. The IAM is the first message in the SS7 call setup process, so even a canceled call will have an IAM. If you are forwarding a call back off-net, then that would be 2 IAM's since it's probably two call legs. I'm not familiar with the billing side of this though... -Scott -----Original Message----- From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org] On Behalf Of Eric Hiller Sent: Monday, February 28, 2011 4:59 PM To: voiceops at voiceops.org Subject: [VoiceOps] IAM Signals I am trying to figure out where the excess of IAM messages is coming from. We get billed for every signal and my bills recently have been saying: SIGNAL SWITCHING...IAM...TERMINATING SIGNALS = 345 SIGNAL FORMULATION...IAM...TERMINATING SIGNALS = 254,181 SIGNAL TNDM SWITCHING...IAM...TERMINATING SIGNALS = 254,181 Is this the count of IAM messages that I am sending to the tandem then? IE. I would have to make 254,181 calls outbound to generate these? Or are these IAM messages inbound and outbound? Is the ratio 1:1 as far as IAM to Calls? Sorry for all the questions, I am just unsure on the IAM details. Thanks! -Eric _______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops