This NENA Standard defines the use of a Feature Group D like signaling protocol between the E9-1-1 selective routing tandem and E9-1-1 customer premises equipment (CPE) which is called Enhanced MF Signaling. This document does not suggest the implementation of Feature Group D trunking – there are tariff issues associated with FGD that do not apply to 91-1. Rather, it recommends borrowing the off the shelf MF signaling protocol from Feature Group D in order to facilitate the delivery of one or two ten-digit ANIs to the PSAP over existing facilities, without creating an entirely new protocol.
The purpose of utilizing Enhanced MF Signaling is to facilitate the delivery of one or two ten-digit ANI transmissions to the PSAP. The protocol supports both.
This document is a guide for designers and manufacturers of selective routing tandems and PSAP CPE. It may also be of value to purchasers, maintainers, and users of such equipment. This document describes the use of Enhanced MF Signaling in place of the protocol described in Bellcore Technical Reference TR-TSY-000350. It does not recommend any changes to, or the replacement of, in-place multi-frequency (MF) signaling used between the E9-1-1 selective routing tandem and the E9-1-1 PSAP CPE, nor does this document recommend any other modifications to selective routing tandems or CPE, beyond those necessary to implement Enhanced MF Signaling. The existing protocol, as described in Bellcore TR-TSY-000350, limits the PSAP to receiving 9-1-1 calls from callers in up to four area codes only. The implementation of Enhanced MF Signaling removes that limitation by delivering all ten digits of the callers telephone number.
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| Enhanced MF Signaling, E9-1-1 Tandem to PSAP.pdf | 126.46 KB |