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In this article, we describe the necessary steps to configure 

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 and Lync for Enhanced Emergency Services (E911) support.

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1 Topology

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Overview

In the context of Internet Telephony, there There are two types of 911 (emergency) calls, Basic and Enhanced:

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When Enhanced Emergency Services are enabled in Lync, location information about a 911 caller is passed to the destination (emergency services dispatcher, police, fire, etc.). 911 calls from Lync clients signed-in at an office location include location information, calls from Lync clients not signed in at an office location (e.g., Starbucks, public library, etc.) are connected to the destination using a fallback 911 route which does not contain location information.

Related Articles

• Configure Enhanced 9-1-1
• Using Lync Setup for E911 Configuration (uses a configuration wizard)

Central Site Configuration

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1. Launch Lync Server 2010 Configuration Manager.
   
   
2. Click Network Configuration on left pane.
   
   
3. Click Location Policy on right pane.
   
   

4. Edit the Global Location Policy as shown below.

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   Caption 0 Figure 1 Configure Location Policy

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 Make sure to Commit the changes after configuring the attributes shown above.

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Caption 0 Figure 1 Trunk Configuration

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Create a Location Information Server (LIS) Subnet

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 Make sure to Commit the changes after configuring the attributes shown above.

Sonus SBC

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Edge Configuration

The configuration steps on the Sonus SBC 1000/2000 are the 

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 are achieved directly via the WebUI broken down in the following sections:

• #SIP Profile
• #Number Transformation
• #Call Routing Table

 

Note
As an alternative, you can configure the SBC Edge using an easy configuration wizard, see Using Lync Setup for E911 Configuration.

 

SIP Profiles

1. In the WebUI, click the Settings tab.
   
   
2. In the left navigation pane, go to SIP > SIP Profiles > relevant SIP Profile.
   
   
3. In the MIME PayloadsPayloads panel:
   1. Configure the ELIN Identifier field as shown below:

   2. Configure the PDIF-LO Passthrough fieldas shown below:

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      0 Figure 1 SIP Profiles

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Number Transformation

In this exercise we create This example uses two Transformation Tables to route calls to a 911 Provider over SIP trunking:

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Transformation Table for calls to E911

A Transformation entry is created for Lync E911, which includes table entries for Called Address/Number, ELIN Identifier, and Callback Pool Identifier (the emergency call back number table or Pasthrough ELIN number used for calls destined to 911). For specific information about the Passthrough ELIN Number, see Creating and Modifying Entries to Transformation Tables.

For easy identification, the Description field matches the Scenario description you configured in Lync Setup.

 

Tip
For instructions on creating and modifying transformation tables, see Managing Transformation Tables and its child pages.

 

1. In the WebUI, click the Settings tab.
2. In the left navigation pane, go to click Transformation.Create

• Click  to create a new Transformation Table

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• . Configure the new table with ELIN Identifier, Called Address/Number, and Calling Address/

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• Number field types as shown below.

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  0 Figure 1 Transformation Table - Calls to E911

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• Note
  icon false
  Use the appropriate value for your location in the Calling Address/Number > Output Field Value field. The

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• Output Field value "

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• noEntries" is only an example.

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• You could use a partial string match or a regular expression to catch all (.*).

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Transformation Table for 911 Fallback calls

1. In the WebUI, click the Settings tab.
   
   
2. In the left navigation pane, go to click Transformation.
   
   

3. Create Click  to create a new Transformation Table with . Configure the new table with ELIN Identifier, Called Address/Number, and Calling Address/NumberNumber field types as shown below.

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   0 Figure 1 Transformation Table - 911 Fallback Calls
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   Use the appropriate value for your location in the Calling Address/Number > Output Field Value field.Image Removed

Call Routing

A Lync E911 entry is created in the Call Routing Table for routing calls from SIP to ISDN. For more information about Call Routing Tables, see Managing Call Routing Tables.

 

1. In the WebUI, click the Settings tab.
   
   
2. In the left navigation pane, go to Call Routing Table.
   
   
3. Click the relevant Call Route table used for calls received from Lync.
   
   

Add two entries in the table: one for calls with configured Office Location Information, and another one that does not have the Location Information as Office. Note that both route entries are destined to 911

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Provider over a SIP Trunk.

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Caption 0 Figure 1 Call Routing

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Note that when integrating with E911 providers, the Call Priority may have to be set to Emergency.

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Call Flow

With above In the example configuration, when a 911 call from Lync client arrives on the Sonus SBC 1000/2000 with the 

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 with the Location Information as Office, Lync will then provide the relevant location profile in the Inbound INVITE message. Sonus SBC 1000/2000 then passes this information to the 911 Provider in the outbound INVITE message.

This can be verified in the logs by tracing the relevant inbound INVITE message from Lync to Sonus SBC 1000/2000the 

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:

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Caption 0 Figure 1 Tracing Relevant Inbound INVITE Message

 

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