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Wireless E911 Guide CG-EWCG-001
BellSouth Wireless E9–1–1/SS7 Interconnection
Guide
Issue 3, January 6, 2004
A.9.1 Call Scenario 1: ESRK Delivery
Call Scenario 1 describes the mode where an MSC uses ISDN User Part (ISUP) protocol to send an
ESRK to an E911 selective router. Call Scenario 1 supports the Wireline Compatibility Mode
1
described
in J-STD-036-A, Annex D, Section D.1.1. Wireless carriers can use Call Scenario 1 to support Phase I
and/or Phase II wireless E911 calls. The table below shows the possible alternatives for populating the
parameters in the Initial Address Message (IAM).
BellSouth’s equivalent of NENA 05-501 Table 4-1 (ESRK Delivery):
ISUP
Parameter
Option
OLI
Wireless
CpCAT
Emergency
CdPN CPN CHGN GDP NDET
signaling
option
Note(s)
A1
No Yes
911 ESRK ESRK Blank E911_STD
(WCM)
1, 2
A2
No Yes
911 ESRK Blank Blank E911_STD
(WCM)
1, 2
A3
No Yes
911 Blank ESRK Blank E911_STD
(WCM)
1, 2
B1
No Yes
911 ESRK ESRK Blank E911_STD
(WCM)
1, 2
B2
No Yes
911 ESRK Blank Blank E911_STD
(WCM)
1, 2
B3
No Yes
911 Blank ESRK Blank E911_STD
(WCM)
1, 2
NOTES:
1. This ISUP parameter option is widely supported in the U.S. It is estimated that 95% of the
E911 selective routers deployed in the U.S. support this option when the selective router has
been equipped with wireless E911 features.
2. "Blank"-- this parameter MUST NOT be populated.
A.9.2 8.2 Call Scenario 2: CBN and ESRD Delivery
Call Scenario 2 describes the mode where a MSC uses ISUP protocol to send the caller’s CBN and
ESRD to an E911 selective router. Call Scenario 2 supports the Phase 2 NCAS
2
mode described in
J-STD-036-A, Annex D, Section D.1.2. Wireless carriers can use Call Scenario 2 to support Phase I
and/or Phase II wireless E911 calls. The table below shows the possible alternatives for populating the
parameters in the Initial Address Message (IAM).
1 J-STD-036 uses the term "Wireline Compatibility Mode" to describe scenarios where MSCs use the ISUP parameter mappings
normally used by landline switches to signal E911 calls to E911 selective routers.
2 J-STD-036 uses the term NCAS to describe scenarios where an MSC uses ISUP protocol to send CBN and ESRD to an
E911 selective router.
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