1. E9-1-1 CALL FLOW ELEMENTS - WIRELINE4
E9-1-1 Tandem 2
End Office
EM Trunks 5
ES Trunks 3
E9-1-1 Tandem w/SRDB
E.O. 6
Public Safety Answering Point
The Local Loop 1
Recent Change Links
PSAP
PSAP ALI Data Links 7
Loop Access Control
ie DLC System 8
ALI
DBASE
Update Links
SCP GATEWAY
(Firewall)
DBMS
Service Providers 9
ALI Database Elements

2. E9-1-1 CALL FLOW ELEMENTS - WIRELESS
MPC
ALI/SR
DBASE 8
PDE E2 7 4 3 9
TDL’s 6 5
PSAP
Public Safety Answering Point
E9-1-1 Tandem w/SRDB 2
MSC
#9 is only applicable in a CAS-Hybrid architecture, such as BellSouth’s WLS911 Solution 1