You shouldn't be getting billed for inbound IAMs, so as Scott said there should be an exact match between outbound call attempts and IAM messages. Billing errors on SS7 traffic is something that does not surprise me, even from industry players who should know better. On 02/28/2011 05:32 PM, Scott Berkman wrote:

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

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