Version 7.2 705 Mediant 1000B Gateway & E-SBC
User's Manual 37. Advanced SBC Features
 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'' on page 377). 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":
Figure 37-3: Example of Call Setup Rule for LDAP Query for ELIN
2. Enable the E9-1-1 feature, by configuring the 'PSAP Mode' parameter to PSAP
Server in the IP Groups table for the IP Group of the PSAP server (see ''Enabling the
E9-1-1 Feature'' on page 290).
3. 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 required for the routing rule from emergency callers to the PSAP server:
• Configure the emergency number (e.g., 911) in the 'Destination Username Prefix'
field.
• Assign the Call Setup rule that you configured for obtaining the ELIN number
from the AD (see Step 1) in the 'Call Setup Rules Set ID' field (see ''Configuring
SBC IP-to-IP Routing Rule for E9-1-1'' on page 292).
37.3 Enabling Interworking of SIP and SIP-I Endpoints
The device can interwork between SIP and SIP-I endpoints for SBC calls. SIP-I endpoints
are entities that are connected to the SS7 PSTN network, referred to as the ISDN User
Part (ISUP) domain. The device supports the SIP-I Application-layer signaling protocol,
which is the standard for encapsulating a complete copy of the SS7 ISUP message in SIP
messages, according to ITU-T Q.1912.5, Interworking between Session Initiation Protocol
(SIP) and Bearer Independent Call Control protocol or ISDN User Part. In other words,
SIP-I is SIP encapsulated with ISUP and the interworking is between SIP signaling and
ISUP signaling. This allows you to deploy the device in a SIP environment where part of
the call path involves the PSTN.
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