This document describes North American emergency call handling procedures in an IMS-based origination network (including steps taken by the originating device and network elements) and routing of such calls to a terminating ESInet or to a legacy Selective Router. This document also describes the interface between the IMS originating network and the ESInet, and between the IMS originating network and a legacy Selective Router.
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ATIS 0300078
Serialization Guideline for Telecommunications Network Infrastructure Equipment
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