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In this article, we describe the necessary steps to configure configure 

Overview

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

• Basic 911 calls contain no location information
• Enhanced 911 calls do contain location information

When When Enhanced Emergency Services are  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.

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To configure the location policy:

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

4. Edit the the Global Location  Location Policy as shown below.

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   Caption 0 Figure 1 Configure Location Policy

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

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To configure a dial plan:

1. Launch Launch Lync Server 2010 Configuration Manager.
   
   
2. Click Click Voice Routing on  on left pane.
   
   
3. Click Click Dial Plan on  on right pane.
   
   
4. Edit the the Dial Plan as  as required.
   
   

5. Add a new new Normalization Rule for  for 911 call as shown below.

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   Caption 0 Figure 1 Configure Dial Plan

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

Route Configuration

1. Launch Launch Lync Server 2010 Configuration Manager.
   
   
2. Click Click Voice Routing on  on left pane.
   
   
3. Click Click Route on  on right pane.
   
   
4. Edit the relevant relevant Voice Route and  and add a new new Pattern for  for 911 call.

5. Be sure to have the relevant 

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   gateway  gateway selected in in Associated Gateways field  field as shown below.

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   Caption 0 Figure 1 Route Configuration

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

Trunk Configuration

1. Launch Launch Lync Server Management Shell.
   
   
2. Check the Trunk Configuration using using Get-CSTrunkConfiguration command command.
   
   
3. Verify that that EnablePIDFLOSupport attribute is  attribute is True. If not:
   1. Run the the Set-CSTrunkConfiguration -EnablePIDFLOSupport $True script script.
   2. Press Press Enter.
   3. Verify that script script Get-CSTrunkConfiguration returns a EnablePIDFLOSupport attribute as  returns a EnablePIDFLOSupport attribute as True, as shown below.

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To create a Location Information Server Subnet:

1. Launch Launch Lync Server Management Shell.
   
   
2. Type Type Set-CsLisSubnet -Subnet 134.56.105.0 -Description "Cubicle" -Location "Office" -CompanyName "Sonus" -HouseNumber "6900" -PreDirectional N -StreetName "Paseo Padre" -StreetSuffix "Pkwy" -City "Fremont" -State "CA" -PostalCode 94555 -Country US as  as shown below.
   
   
3. Press Press Enter.

Location Policy Configuration

1. Launch Launch Lync Server 2010 Configuration Manager.
   
   
2. Click Click Network Configuration on  on left pane.
   
   
3. Click Click Location Policy on  on right pane.
   
   
4. Edit the relevant relevant Voice Route.
   
   
5. Select the the Enable enhanced emergency services check  check box.

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

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SIP Profiles

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

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

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      Caption 0 Figure 1 SIP Profiles Image RemovedImage Added

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Number Transformation

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

• Transformation for calls from Lync clients signed-in at at Office Locations Locations.
• Transformation for calls from Lync clients signed-in at at Remote Locations  Locations such as Starbucks, etc..

Transformation Table for calls to E911

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

3. Create a new new Transformation Table with  with ELIN Identifier, Called Address/Number, and and Calling Address/Numberfield types as shown below.

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   Caption 0 Figure 1 Transformation Table - Calls to E911 Image RemovedImage Added

    

    

   Note
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   The Input Match Field value "Office" is only an example. Instead of exact match, 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 the Settings tab tab.
   
   
2. In the left navigation pane, go to to Transformation.
   
   

3. Create a new new Transformation Table with  with ELIN Identifier, Called Address/Number, and and Calling Address/Numberfield types as shown below.

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   Caption 0 Figure 1 Transformation Table - 911 Fallback Calls Image RemovedImage Added

Call Routing

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

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

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   Caption 0 Figure 1 Call Routing Image RemovedImage Added

    

    

   Note
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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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With above configuration, when a 911 call from Lync client arrives on the Sonus SBC 1000/2000 with the Location Information as 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 the 911 Provider in  in the outbound INVITE message.

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

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