Iridium

voice path

„@

Based on Number

Received performs

Number translation

And signals to PSTN

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Call Setup Request

To Terminating GW

„C

Answered

Terminating

PSTN

Gateway

„B

Answered

„A

Outgoing Call

Request dialed

number to PSTN

Originating

Servicing

Gateway

„D

Answered

ğ Subscriber dials

a PSTN number

ƒý

ISU Request

Service

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