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Overview

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

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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 Image Modified

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

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

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

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   Caption 0 Figure 1 Configure Dial Plan Image Modified

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

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

5. Be sure to have the relevant 

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   gateway selected in Associated Gateways field as shown below.

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   Caption 0 Figure 1 Route Configuration Image Modified

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

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Create a Location Information Server (LIS) Subnet

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Location Policy Configuration

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

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

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

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      Caption 0 Figure 1 SIP Profiles Image Modified

       

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Number Transformation

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

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

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

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   Caption 0 Figure 1 Transformation Table - Calls to E911 Image Modified

    

    

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

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

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   Caption 0 Figure 1 Transformation Table - 911 Fallback Calls Image Modified

    

    

Call Routing

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.
   
   

4. 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 Providerover a SIP Trunk.

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   Caption 0 Figure 1 Call Routing Image Modified

    

    

   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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Call Flow

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

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