User’s Manual of GS-5220 LCD Series
468
Object Description
• Emergency Call
Service
Emergency Call Service ELIN identifier data format is defined to carry
the ELIN identifier as used during emergency call setup to a traditional
CAMA or ISDN trunk-based PSAP. This format consists of a numerical
digit string, corresponding to the ELIN to be used for emergency calling.
Policies
Network Policy Discovery enables the efficient discovery and diagnosis of mismatch issues with the VLAN
configuration, along with the associated Layer 2 and Layer 3 attributes, which apply for a set of specific protocol
applications on that port. Improper network policy configurations are a very significant issue in VoIP
environments that frequently result in voice quality degradation or loss of service.
Policies are only intended for use with applications that have specific 'real-time’ network policy requirements,
such as interactive voice and/or video services.
The network policy attributes advertised are:
1. Layer 2 VLAN ID (IEEE 802.1Q-2003)
2. Layer 2 priority value (IEEE 802.1D-2004)
3. Layer 3 Diffserv code point (DSCP) value (IETF RFC 2474)
This network policy is potentially advertised and associated with multiple sets of application types supported on
a given port. The application types specifically addressed are:
1. Voice
2. Guest Voice
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