MVA Jump Start

Module5

Configuring and Deploying Emergency Calling

Module Overview

• Introducing Location Information Server

• Overview of Setup and Call Flow

• Designing Location Policies

• Implementing LIS

• Address Discovery

• User Experience

Lesson 1: Introducing Location Information Server

• What Is Location Awareness?

• "Location Aware" Emergency Routing

• Voice Routing

• E9-1-1 Lync Server 2013 Components

What Is Location Awareness?

• Location Information Service (LIS)

• Identify and populate user location in the client

•Affects routing of emergency calls

• Provides street address for E911

"Location Aware" Emergency Routing

• Emergency calls can be routed to specific PSTN gateways by Location Policy

• Location Policy can be assigned to network site

• Example: User roaming outside

North America

• User travelling in Ireland dials 112

(for emergency)

• Call is routed to a local gateway

Voice Routing

Announcement orCall Park Application

1. Vacant Number Range

2. Call Park Orbit Range

DialingBehaviors

Routing &Authorization

Normalization Rule

Normalization Rule

Normalization Rule

Dial Plan

PSTN Usage

PSTN Usage

PSTN Usage

3. Voice Policy Routes

Route

RouteRoute

Route

External Endpoint Receives Call UC Endpoint Receives Call

User Initiates Call

User=phone

Yes

Global?

No

SIP URI

Match

Reverse Number Lookup

No match

Mediation Server andTrunk Configuration

Gateway / IP-PBX / SIP Trunk Inbound Routing

404: No matching rule

403: No route found

Yes

EmergencyCall?

No

PSTN Usage

Location Policy

Call Park Orbit Range

E9-1-1 Lync Server 2013 Components

• Can be “location aware” or static assignment

• Defines emergency numbers

• Defines emergency call routing

• Defines IM notification destination

• Defines security desk phone number for conference

Location

Policies

• Takes BSSID, MAC, Subnet, Switch/Port and returns

validated location

• Validates addresses against the Master Street Address

Guide (MSAG)

• Validated LIS address returned is passed to

E911 provider via PIDF-LO (Presence Information Data

Format Location Object

Location

Information

Server (LIS)

Lesson 2: Overview of Setup and Call Flow

• E9-1-1 Configuration

• Location Discovery

• Placing an Emergency Call

E9-1-1 Configuration

•Q

Admin

Lync Server 2013 Infrastructure

LIS WSFE

E9-1-1 Service Provider

MSAG

SBC

PSTN

Internet

SIP

Trunk

2

3

4

Location Discovery

Caller

Lync Server 2013 Infrastructure

LIS WSFE

E9-1-1 Service Provider

MSAG

SBC

PSTN

Internet

SIP

Trunk

2

1

3

4

Placing an Emergency Call

• S

Caller

Security

PSAP

Lync Server 2013 Infrastructure

LIS WSFE

E9-1-1 Service Provider

MSAG

SBC

PSTN

Internet

SIP

Trunk

1

2

4a3

4b

5

3

Lesson 3: Designing Location Policies

• Location Policy Definition

• Location Policy Scope

• PSTN Usage Creation

• Voice Route Creation

• PIDF-LO Support on Trunk

Location Policy Definition

•Defines user experience, routing, dial string, and Security Desk

notification

Location Policy Scope

• If present, apply the policy

assigned to network siteNote: This is a “user” policy that you create

and assign to the network site

•Or, if present, apply the policy

assigned to user

•Or, consider the Topology Site

Policy, and then the Global

Location Policy

Global Policy

Topology Site Policy

User Policy

User Policy

Assigned to

user

Assigned to

network site

PSTN Usage Creation

• The Location Policy PSTN Usage selects a route for the emergency

call

• This may be the service provider’s SIP trunk (one usage for all

location policies) or it may be a local gateway (a unique usage for

each policy)

• The PSTN Usage is not added to existing Voice policies:– It is used for an emergency call if a user has a Location Policy applied

• You can create PSTN Usage in either Lync Server Control Panel or

Lync Server Management Shell

PS>Set-CsPstnUsage –Usage @{add="EmergencyCallsUsage"}

Voice Route Creation

• The Voice Route allows calls to the Emergency Number to go

through the PSTN Gateway that references the Emergency Service

Provider

Note: It does not differ from any other Voice Route

PS>New-CsVoiceRoute –Name "EmergencyCallsRoute" -NumberPattern

"^\+911$" –PstnUsage @{add="EmergencyCallsUsage"} –PstnGatewayList

@{add="e911gw.fabrikam.net"}

Identity : EmergencyCallsRoute

Priority : 3

Description :

NumberPattern : ^\+911$

PstnUsages : {EmergencyCallsUsage}

PstnGatewayList : {PstnGateway:e911gw.fabrikam.net}

Name : EmergencyCallsRoute

SuppressCallerId :

AlternateCallerId :

PIDF-LO Support on Trunk

• To send location information to

the E911 certified provider,

PIDFLO information must be

allowed to transit through the

Lync Trunk

• Ensure that

EnablePIDFLOSupport on the

Trunk is set to True

PS>Get-CsTrunkConfiguration

Service:PstnGateway:e911gw.fabrikam.net

Identity :

Service:PstnGateway:e911gw.fabrikam.net

OutboundTranslationRulesList : {}

SipResponseCodeTranslationRulesList : {}

Description :

ConcentratedTopology : True

EnableBypass : False

EnableMobileTrunkSupport : False

EnableReferSupport : True

EnableSessionTimer : False

EnableSignalBoost : False

MaxEarlyDialog : 20

RemovePlusFromUri : True

RTCPActiveCalls : True

RTCPCallsOnHold : True

SRTPMode : Required

EnablePIDFLOSupport : True

Set-CsTrunkConfiguration -Identity "Service:e911gw.fabrikam.net" -

EnablePIDFLOSupport $true

Lesson 4: Implementing LIS

• Location Information Server (1 of 2)

• Location Information Server (2 of 2)

• Configuring Location Information Server

• Location Information Server - Subnet

• Address Status

Location Information Server (1 of 2)

• Part of Lync Server 2013 web services components:– Load-balanced within a cluster for high availability

• Precedence of matching client location requests:– Basic service set identifier (BSSID) of Wi-Fi AP

– Switch/port from Link Layer Discovery Protocol Media Endpoint (LLDP-MED)

– Switch from LLDP-MED

– Subnet

• Media Access Control (MAC) match of switch/port– 3rd Party solution

Location Information Server (2 of 2)

• Microsoft Windows PowerShell and GUI-based administration

• Follows NENA “i2” reference architecture for address validation

• Follows Internet Engineering Task Force (IETF) Presence Information

Data Format Location Object (PIDF-LO) standards with extensions for

location format

• Other vendor/in-house LIS can be integrated:– Adhere to schema

Configuring Location Information Server

• Network identifiers are associated with street addresses:– BSSID

– Subnet

– Switch

– Switch/Port

• The size of this data set will correspond to how detailed the locations are and

whether wireless is within scope

• You can use Windows PowerShell scripts to import this data from .csv files

• Address management–related administrative tasks include:– Configuring the address validation service provider

– Uploading validation credentials

– Validating the addresses and error correction

Location Information Server - Subnet

• Configure the LIS subnet

Note: There is no subnet mask. The client uses its own IP/subnet mask to

determine its subnet, and then sends this in the Web Query to the LIS Web

Service

• Publish the LIS configuration

Set-CsLisSubnet -Subnet 172.16.20.0 -Description "Munchen" -

Location "Munchen"

-CompanyName "Fabrikam" -HouseNumber 2 -StreetName "Lindenstrasse"

-City "Munchen"

-Country DE

Publish-CsLisConfiguration

Address Status

• Every address added to the LIS database should be validated by a

Master Street Address Guide (MSAG)

•MSAG validation ensures that emergency calls can be correctly

routed

Lesson 5: Address Discovery

• Client Location Request

• Automatically Acquiring a Location

• Using a MAC Address to Find a Location

• E9-1-1 Support for Remote Users

Client Location Request

• Location Request includes the following information:– Link Layer Discovery Protocol (LLDP) from Layer 2 connection – switch and port IDs (if

available)

– Subnet

– WAP BSSID (if available)

– MAC address

• LLDP is not supported for Lync on Windows 7 and earlier:– This makes it difficult to get detailed locations for wired softphones

– You will need to use an SNMP application in order to do this

• LLDP is supported on Lync Phone Edition:– Switches may need upgrades to support LLDP

Automatically Acquiring a Location

• Location database is global – each LIS has all defined locations

• Client automatically initiates a “location request” to its LIS:– Includes its network connectivity data

• LIS location matches precedence:– Wi-Fi AP BSSID

– LLDP-MED Switch/Port

– LLDP-MED Switch

– Subnet

– MAC (If configured via Set-CsWebServiceConfiguration -MacResolverUrl) for third-party

• If a location is not found, the request can be sent to an external database

(Set-CsWebServiceConfiguration –SecondaryLocationSourceUrl)

Using a MAC Address to Find a Location

• Lync does not natively map MAC address to Location information

• LIS must resolve MAC address into Switch/Port for resolution:– Lync client sends MAC address, and then:

1) LIS queries external MAC Resolver via Web Services

2) MAC Resolver returns Switch/Port

3) LIS uses Switch/Port to return location information to client

• This raises a question: What is a MAC Resolver?

– It is an appliance provided by the Service Provider

– 911Enable MAC Resolver = Phone Discovery Manager (PDM such as 911

Enabling’s Soultion)

E9-1-1 Support for Remote Users

• LIS Web Service is not exposed to external users

• How it works:1) Users self-report their location

2) The call is automatically routed to the Emergency Call Response Center

(ECRC) with location data

3) The ECRC confirms the location with caller, and then transfers the call to the

correct PSAP

Lesson 6: User Experience

• Manual Location Entry

• Emergency Dialing

• Security Desk Integration

Manual Location Entry

• Location Policy field LocationRequired

impacts user experience:

• Location Required = No:

• User not prompted

• Location Required = Yes:

• UI highlights location with “X” and “!” for emphasis

• Can be dismissed without warning

• Location Required = Disclaimer:

• UI highlights location with “X” and “!” for emphasis

• Disclaimer shown when dismissed

• Only shows during sign in. No effect on call

Emergency Dialing

•User dials emergency number

•Call goes straight through to the correct PSAP:

• If the location has been validated

Security Desk Integration

• IM automatically established between

emergency caller and security desk:

• Location information is contained in the

conversation window

•An E.164 number can be bridged

onto emergency calls

• One-way / two-way

• Partner is responsible for initiating

conference – cannot be tested without a

partner solution in place

Module Review and Takeaways

• Review Question(s)

• Real-world Issues and Scenarios

• Tools

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