CHAPTER16 Services
Mediant 1000 Gateway & E-SBC | User's Manual
➢ To configure the E9-1-1 callback timeout
1. Open the Priority & Emergency page (Setup menu > Signaling & Media tab > SIP
Definitions folder > Priority and Emergency).
2. In the 'E911 Callback Timeout' field (E911CallbackTimeout), enter the required callback
timeout.
3. Click Apply.
Configuring the SIP Release Cause Code for Failed E9-1-1 Calls
When a Skype for Business client makes an emergency call, the call is routed through the
Microsoft Mediation Server to the ELIN device, which sends it on to the PSTN. In some scenarios,
the call may not be established due to either the destination (for example, busy or not found) or the
ELIN device (for example, lack of resources or an internal error). In such a scenario, the Mediation
Server requires that the ELIN device "reject" the call with the SIP release cause code 503 "Service
Unavailable" instead of the designated release call. Such a release cause code enables the
Mediation Server to issue a failover to another entity (for example, another ELIN device), instead of
retrying the call or returning the release call to the user.
To support this requirement, you can configure the ELIN device to send a 503 "Service
Unavailable" release cause code instead of SIP 4xx if an emergency call cannot be established.
The feature is applicable only to the Gateway application and for digital interfaces.
➢ To enable SIP response 503 upon failed E911:
1. Open the Advanced Parameters page (Setup menu > Signaling & Media tab > Gateway
folder > Gateway Advanced Parameters).
2. From the 'Emergency Special Release Cause' drop-down list
(EmergencySpecialReleaseCause), select Enable.
3. Click Apply.
Configuring SBC IP-to-IP Routing Rule for E9-1-1
To route incoming E9-1-1 calls to the emergency service provider's PSAP server, you need to
configure routing rules in the IP-to-IP Routing table for routing between the emergency callers' IP
Group and the PSAP server's IP Group. The only special configuration is to define the emergency
number (e.g., 911) in the 'Destination Username Pattern' parameter of the IP Group belonging to the
E9-1-1 callers. The following example shows IP-to-IP routing rules for E9-1-1 in a Skype for
Business environment:
This feature is applicable only to the SBC application.
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