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CG-EWCG-001 Wireless E911 Guide
Issue 3, January 6, 2004 BellSouth Wireless E9–1–1/SS7 Interconnection
Guide
WARNING
If an MSC switch can support a GDP, and if Wireline Compatibility
Mode is NOT desired, then the GDP is the recommended place
to put the pANI.
If the WSP will be using a Non Callpath Associated Signaling (NCAS) Solution (as described in
J-STD-036-A, Annex-D, Section D.1.2) that intends to deliver the Call Back Number (CBN) and the pANI
to the PSAP via the trunk between the Selective Router and the PSAP, Table "C" below illustrates an
acceptable interconnection method. In this interconnection method BOTH a pANI (ESRD) and the CBN
(aka: MDN) are sent in the SS7/ISUP IAM directly from the WSPs MSC over dedicated trunks into the
BellSouth NDET. The pANI is used by the NDET for selective routing, and then the CBN and the pANI
are sent to the PSAP using Enhanced MF signaling (E-MF). This is of course dependant on the ability of
the PSAP CPE to receive and utilize E-MF. As of 3Q2003 no PSAPs in BellSouth’s E9-1-1 service area
are using E-MF, but many may migrate toward it beginning in 4Q2003 or 1Q2004.
When using this interconnection method the NCAS Solution provider might still create a record in the
BellSouth the ALI database containing the pANI &/or the CBN (among other data normally included by
the NCAS provider, which may or may not also include Phase 2 data). That is beyond the scope of this
document.
See Table “C” below.
See prior page for an explanation of when this type of interconnection is acceptable. (NDET uses
signaling option WRLS_CLD because MSC cannot support GDP).
Extracted in part from J-STD-036-A, Annex-D, Section D.1.2, b
ut clarified for use in BellSouth
Table "C" ISUP Initial Address Message Parameter Contents for Phase 2 NCAS
In this mode both an ESRD and the MDN are sent in the IAM, assuming that the trunk between the
Selective Router and the PSAP supports transport of at least two 7/10-digit numbers.
NOTE:
This 20 digit solution can be used between the MSC and the NDET even if the PSAP is not capable of
receiving 20 digits from the NDET. This is accomplished by using the BellSouth Wireless E9-1-1 Solution
(WLS911), a Hybrid architecture functional in both Phase 1 and Phase 2 environments. WSPs should see
their BellSouth account team for details on how the WLS911 Solution may be of value in their overall
architecture plans.
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