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CG-EWCG-001 Wireless E911 Guide
Issue 3, January 6, 2004 BellSouth Wireless E9–1–1/SS7 Interconnection
Guide
1. For an ESC, the ISUP Called Party Number parameter shall only be populated with the
digit value "911".
2. The Calling Party Number MUST be included in the IAM message. The Charge Number may
also be included in the IAM, but if so it MUST be the SAME as the Calling Party Number.
3. The Generic digits parameter SHALL NOT be included in the IAM.
A.8.2 ISUP Initial Address Message Parameter Contents for NCAS (NDET uses
signaling option WRLS_STD, because MSC c
an
support GDP)
(NCAS as described in J-STD-036-A, Annex-D, Section D.1.2)
As this (NDET) signaling option’s name implies, this should only be used on trunks handling wireless
traffic exclusively, and is the industry standard for wireless calls (on an NDET). This option uses the pANI
in the Generic Digits parameter to route the call and uses the Calling Party Number Parameter as the
callback number. 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 "B" 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 “B” below.
See prior page for an explanation of when this type of interconnection is acceptable.
NDET uses signaling option WRLS_STD, because MSC c
an support GDP)
Extracted in part from J-STD-036-A, Annex-D, Section D.1.2, but clarified for use in BellSouth
Table "B" 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
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