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Some Emergency Service provider's phone systems do not send the Connect message to establish the call fully end to end, even after the operator answers the call. If the call originates from a SIP device or a Lync Skype client it will result in one way audio. This Best Practice describes how to configure the

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SBC 1000/2000 to force the originating device to open the voice path in both directions in situations where the Connect message is not received from the terminating carrier.

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There are two options to verify if 911 emergency services configuration is required for establishing calls: Configuring Calls to Emergency Services on PSTN Lines#Verify Verify through WebUI Monitor or Configuring Calls to Emergency Services on PSTN Lines#Verify Verify through Logs.

Info

For Digital, this procedure applies to CAS and ISDN calls.

For Analog, this procedure applies to FXS devices, such as an Overhead pager.

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  1. Access Settings> Telephone Mappings Table.
  2. Create and configure a Message Translation table (i.e., Alerting to Connect). See Creating and Modifying Entries to Message Translation Tables).
  3. Configure Message Type as Alerting/180 Ringing.
  4. Apply changes.

 


For ISDN calls

  1. Access Settings> Telephone Mappings Table.
  2. Create and configure a Message Translation table (i.e. Proceeding to Connect). See Creating and Modifying Entries to Message Translation Tables.
  3. Configure Message Type as Proceeding (ISDN only).
  4. Apply changes.

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Step 2: Create Transformation Table

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Note

This example applies only if the call has originated from LyncSkype, and Lync Skype is configured to prepend the '+' sign.

This configuration is for 911 calls going from Lync→T1→ Skype→T1→ 911.

  1. Access Settings> Transformation.
  2. Create a call Transformation Table for 911 calls (i.e., LyncToT1SkypeToT1-911). See Creating and Modifying Entries to Transformation Tables.
  3. Configure per parameters below.
  4. Apply changes.

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For all Other Call Destinations

This configuration is applicable for regular calls (non 911) going from Lync Skype to the T1 carrier.

  1. Access Settings> Transformation.
  2. Create a call Transformation Table for all other call destinations except 911 (i.e., Lync to Skype to T1). See Creating and Modifying Entries to Transformation Tables).
  3. Configure per parameters below.
  4. Apply changes.

 


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Step 3: Add Transformation Table to the Call Route Table

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Add the Transformation table (LyncToT1SkypeToT1-911) to the Routing table used for routing IP calls (911) to the T1 carrier.

  1. Access Settings > Call Routing Table.
  2. Create a Call Route for 911 calls (i.e., Emergency Calls).
  3. Select the Number/Name Transformation Table that includes 911 specifications (i.e, LyncToT1SkypeToT1-911 calls).
  4. (For CAS only) Select the Message Translation table that includes Alerting/180 Ringing (i.e., Alerting To Connect).
  5. (For ISDN calls only) Select the Message Translation table that includes Proceeding (ISDN only) (i.e., Proceeding To Connect).

 


For all other IP calls

Add a Transformation table (LyncToT1SkypeToT1) to the Routing table used for routing IP calls to the T1 carrier.

  1. Access Settings > Call Routing Table.
  2. Create a Call Route for all IP calls (not 911).
  3. Select the Number/Name Transformation Table created for all IP calls (i.e, LyncToT1 SkypeToT1 calls).

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