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CG-EWCG-001 Wireless E911 Guide
Issue 3, January 6, 2004 BellSouth Wireless E9–1–1/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 Technical Information 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 SUPPORTED on 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 Technical Information 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 SUPPORTED on 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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