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Fill-in the setup fields and click Apply as shown in below example:

E911 Specific Settings on

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Upon a successful Lync 2010 Setup run, wizard will create your 

Transformation Table
The wizard creates the following transformation table entry for 911 calls in the outbound direction which are directed to PSAP number as shown below:

SIP to ISDN Call Route Entry
The wizard creates the following SIP to ISDN Call Route Entry for 911 calls in the outbound direction which are directed to relevant ISDN Signaling Group as shown below:

SIP Profile

The wizard creates the following SIP Profile configured with the ELIN Identifier and PIDF-LO enabled as shown below:

Emergency Services Configuration
The wizard creates the Emergency Services configured with 24 hours Call Status Duration (default) as shown below (note that this is a 1 through 24 hour configurable item):

Callback Number Pool

Make sure that the Callback Number Pool is created with the Callback number (2020 in this example) and with the PSAP number (6228 in this example) as shown below:

Verification

Lync User Makes a 911 Call

1. Lync User +1(510)250-2001 dials +911.
2. Call is routed to the Sonus SBC 1000/2000.
3. The Sonus SBC 1000/2000 transforms the called party number +911 to the PSAP number 6228 and sends it out to the PSTN.
4. When the 911 Operator 6228 answers the call, parties go on-hook and terminate the call.

The relevant SIP INVITE message for above call setup is as shown below:

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The Sonus SBC 1000/2000 sends out this INVITE message to PSTN as a ISDN SETUP message as shown below:

Sonus SBC 1000/2000 WebUI > Settings - Call Status Table (in navigation pane) lists the relevant Emergency Call as shown below:

911 Operator Performs Callback on Previous Call

1. 911 Operator PSAP number 6228 performs a callback to Emergency Callback Number 2020.

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    Receives the ISDN SETUP message

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    finds an entry in Callback Status Table for Callback Number 2020 with the relevant Calling Number +1(510)250-2001

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    routes the call to Lync, and Lync reaches out to the original calling party +1(510)250-2001

The relevant ISDN SETUP message for above call setup, as shown below:

Sonus SBC 1000/2000 routes the call and send a S_SIP INVITE_ message to the Lync Server, as shown below:

Emergency Calls in Alarm View

Every time an Emergency 911 call or PSAP callback call is received on the