CG-EWCG-001 WirelessE911 Guide
Issue 3, January 6, 2004 BellSouth WirelessE9–1–1/SS7 Interconnection
Guide
A1, A2, A3, B1, B2, and B3 are supported using the E911_STD trunk options on the BellSouth Nortel
DMS E9-1-1 Tandem(Referred to as NDET throughout this document.). For all practical purposes these
calls appear to be like wireline calls at the NDET.
A.2.1.2 Call Scenario 2, CBN and ESRD Delivery - WITHOUT a hybrid: (WITHOUT a
hybrid architecture at the Selective Router)
BellSouth supports the following options as listed in table 4-2 (CBN and ESRD Delivery)in "NENA
05-501 TechnicalInformation Document on SS7 Guidelines for MSC to Selective Router Connectivity":
A1, A2, B1, B2, C1, C2, D1, D2 are supported using the E911_STD or WRLS_STD trunk options on
the BellSouth NDET.The strongly preferred, and recommended, trunk option is WRLS_STD because it
is seen as the standard for wireless E9-1-1 calls.
A3, B3, C3, D3 are supported using the E911_STD trunk option only.
E1, E2, F1, F2, G1, G2, H1, H2, I1, I2, J1, J2, K1, K2, L1, L2 are supported using ONLY the WRLS_CLD
option on the NDET.
Option I3 is NOT SUPPORTEDon the NDET platform.
NOTE:Call scenario 2 is sometimes called "20 digits to the PSAP". In Phase 1 it was known as Callpath
Associated Signaling (CAS). In Phase 2 (according to J-STD-036-A) it is known as Non-Callpath
Associated Signaling (NCAS).
A.2.1.3 Call Scenario 2, CBN and ESRD Delivery - WITH a hybrid: (WITH a hybrid
architecture at the Selective Router)
BellSouth supports the following options as listed in table 4-2 (CBN and ESRD Delivery)in "NENA
05-501 TechnicalInformation Document on SS7 Guidelines for MSC to Selective Router Connectivity":
A1, A2, B1, B2, C1, C2, D1, D2 are supported using the E911_STD or WRLS_STD trunk options on
the BellSouth NDET.The strongly preferred, and recommended, trunk option is WRLS_STD because it
is seen as the standard for wireless E9-1-1 calls.
A3, B3, C3, D3 are supported using the E911_STD trunk option only.
E1, E2, F1, F2, G1, G2, H1, H2, I1, I2, J1, J2, K1, K2, L1, L2 are supported using ONLY the WRLS_CLD
option on the NDET.
Option I3 is NOT SUPPORTEDon the NDET platform.
NOTE:Call scenario 2 is sometimes called "20 digits to the PSAP". In Phase 1 it was known as Callpath
Associated Signaling (CAS). In Phase 2 (according to J-STD-036-A) it is known as Non-Callpath
Associated Signaling (NCAS).
NOTE:Call Scenario 2, CBN and ESRD Delivery - WITH a hybrid is available on ALL of BellSouth’s
(64) NDETs.
A.2.1.4 Call Scenario 3, CBN, ESRD and GLP Delivery: (GLP = Geodetic Location
Parameter)
BellSouth does not support this method at this time due to the inability of the selective router platform and
the MSC platforms to use and/or route on the GLP,or to support ISDN PSAPs in an industry standard
manner.
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