E9-1-1 Call Flow Wireline/Wireless/VoIP Andy Nielsen California 9-1-1 Emergency Communications Office 05/06/2008

E9-1-1 Call FlowE9-1-1 Call Flow

Wireline/Wireless/VoIPWireline/Wireless/VoIPAndy NielsenAndy Nielsen

California 9-1-1 Emergency Communications OfficeCalifornia 9-1-1 Emergency Communications Office

05/06/200805/06/2008

May 6, 2008May 6, 2008 California 9-1-1 Emergency Communications OffiCalifornia 9-1-1 Emergency Communications Officece

22

E9-1-1 BasicsE9-1-1 Basics

S/R

PSAP

Database

Network

CPE

The three basic ingredients for E9-1-1 call processing:Network, Database, and CPE

ALI

DB


33

The E9-1-1 NetworkThe E9-1-1 Network

S/R

ALI

DB

PSAPEnd-office

Switch

End-office to Tandemor Selective RouterTrunk group

PSAP trunk group

ALI Frame Relay Network


44

Wireline Call-flowWireline Call-flow


55

Wireline E9-1-1 Call-Wireline E9-1-1 Call-flowflow

S/R

ALI

DB

PSAPEnd-office

Switch

Caller dials “9-1-1”

“9-1-1”

Call is sent to S/R with ANI

ANI

S/R sends ANI to the ALI DB for ESN look-up

ESN (which identifies the PSAP) is sent back to the S/R

ANI ESN

Call and ANI are sent to PSAP

ANI


66


S/R

ALI

DB

PSAPEnd-office

Switch“9-1-1”

ANI

ANI ESN

ANI

CPE at PSAP sends ANI to ALI DB for ALI look-up


77


S/R

ALI

DB

PSAPEnd-office

Switch“9-1-1”

ANI

ANI ESN

ANI

ANI

ALI is sent from the ALI DB to the PSAP

ALI


88

Wireless Call-flowWireless Call-flow


99

Wireless E9-1-1 Call-Wireless E9-1-1 Call-flowflow

S/R

ALI

DB

PSAPEnd-office

Switch


1010


S/R

ALI

DB

PSAPEnd-office

Switch


1111


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider


1212


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

Wireless caller dials 9-1-1

“9-1-1”


1313


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

The MSC requests PSAP info from the 3rd Party DB

provider


1414


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

The 3rd Party DB sends pANI (which identifies the

proper PSAP) back to MSC

pANI


1515


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

pANI

The MSC sends the caller and the pANI to the S/R, where it follows the same

wireline call flow

pANI


1616


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

pANI

pANI

S/R sends pANI to the ALI DB for ESN look-up


1717


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

pANI

pANI

pANI ESN (which identifies the PSAP) is sent back to the S/R


1818


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

pANI

pANI

pANI ESN

Call and pANI are sent to PSAP


1919


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

pANI

pANI

pANI ESN

CPE at PSAP sends pANI to ALI DB for ALI look-up

pANI


2020


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

pANI

pANI

pANI ESN

pANI

ALI DB determines pANI belongs to 3rd Party DB provider and sends request over steering links to 3rd Party DB

pANI

pANI


2121


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

pANI

pANI

pANI ESN

pANI

pANI

pANI

3rd Party DB looks up pANI, determines call back number, populates ALI record and sends back to ALI DB

ALI record


2222


S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider

“9-1-1”

pANI

pANI

pANI ESN

pANI

pANI

pANI

ALI record

ALI DB passes ALI record on to PSAP

ALI


2323

VoIP Call-flowVoIP Call-flow


2424

VoIP E9-1-1 Call-FlowVoIP E9-1-1 Call-Flow

S/R

ALI

DB

PSAP

MobileSwitching

Center(MSC)

3rd Party DB

provider


2525


S/R

ALI

DB

PSAP

3rd Party DB

provider

VoIP Service Provider (VSP)


2626


S/R

ALI

DB

PSAP

3rd Party DB

provider


Caller dials 9-1-1

“9-1-1”

VoIP caller is sent to 3rd Party DB

provider


2727


The 3rd Party DB determines what PSAP to send caller to, and sends pANI with call to

S/R via Emergency Services Gateway

S/R

ALI

DB

PSAP

3rd Party DB

provider


“9-1-1”Caller and pANI

The VoIP call now follows the same wireline call flow


2828


S/R

ALI

DB

PSAP

3rd Party DB

provider


“9-1-1”pANI

S/R sends pANI to the ALI DB for ESN look-up


2929


S/R

ALI

DB

PSAP

3rd Party DB

provider


“9-1-1”pANI

pANI

ESN (which identifies the PSAP) is sent back to the S/R


3030


S/R

ALI

DB

PSAP

3rd Party DB

provider


“9-1-1”pANI

pANI ESN

Call and pANI are sent to PSAP


3131


S/R

ALI

DB

PSAP

3rd Party DB

provider


“9-1-1”pANI

pANI ESN

pANI

CPE at PSAP sends pANI to ALI DB for ALI look-up

pANI

ALI DB determines pANI belongs to 3rd Party DB provider and sends request over steering links to 3rd Party DB

pANI


3232


S/R

ALI

DB

PSAP

3rd Party DB

provider


“9-1-1”pANI

pANI ESN

pANI

pANI

pANI

3rd Party DB looks up pANI, determines call back number, populates ALI record and sends

back to ALI DB

ALI record ALI DB passes ALI record on to PSAP

ALI


3333

NGEN Call-Flow

Under Construction!!

Documents

E9-1-1 Call Flow Wireline/Wireless/VoIP Andy Nielsen California 9-1-1 Emergency Communications Office 05/06/2008