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CHAPTER37 Advanced SBC Features

Mediant 1000 Gateway & E-SBC | User's Manual

➢ To configure SBC emergency call preemption:

1. In the Message Conditions table (see Configuring Message Condition Rules), configure a

Message Condition rule to identify incoming emergency calls. See above for examples.

2. Open the SBC General Settings page (Setup menu > Signaling & Media tab > SIP

Definitions folder > Priority and Emergency), and then scroll down to the Call Priority and

Preemption group:

3. From the 'Preemption Mode' drop-down list (SBCPreemptionMode), select Enable to enable

call preemption.

4. In the 'Emergency Message Condition' field, enter the row index of the Message Condition rule

that you configured in Step 1.

5. (Optional) Assign DiffServ levels (markings) to packets belonging to emergency calls:

● In the 'Emergency RTP DiffServ' field (SBCEmergencyRTPDiffServ), enter the QoS level

for RTP packets.

● In the 'Emergency Signaling DiffServ' field (SBCEmergencySignalingDiffServ), enter the

QoS level for SIP signaling packets.

6. Click Apply.

Emergency Call Routing using LDAP to Obtain ELIN

The device can route emergency calls (e.g., 911) for INVITE messages that are received without

an ELIN number. This is in contrast to when the device is deployed in a Microsoft Skype for

Business environment, whereby INVITE messages received from Skype for Business contain

ELIN numbers. For a detailed explanation on ELIN numbers and handling of emergency calls by

emergency server providers, see E9-1-1 Support for Microsoft Skype for Business.

To obtain an ELIN number for emergency calls received without ELINs, you can configure the

device to query an LDAP server for the 911 caller's ELIN number. The device adds the resultant

ELIN number and a Content-Type header for the PIDF XML message body to the outgoing INVITE

message, for example:

Content-Type: application/pidf+xml

➢ To enable emergency call routing using LDAP to obtain ELIN:

1. Configure a Call Setup rule in the Call Setup Rules table (see Configuring Call Setup Rules).

The following example shows a Call Setup rule that queries an Active Directory (AD) server for

the attribute "telephoneNumber" whose value is the E9-1-1 caller's number (source), and then

retrieves the user's ELIN number from the attribute "numberELIN":

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AudioCodes E-SBC User Manual

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