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Application Guide

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Software User's
Manual
–
Version 3.0
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
3. Softphone Voice
4. Video Conferencing
5. Streaming Video
6. Control / Signalling (conditionally support a separate network policy for the media types above)
A large network may support multiple VoIP policies across the entire organization and different
policies per application type. LLDP-MED allows multiple policies to be advertised per port, each
corresponding to a different application type. Different ports on the same Network Connectivity Device
may advertise different sets of policies based on the authenticated user identity or port configuration.
It should be noted that LLDP-MED is not intended to run on links other than between Network
Connectivity Devices and Endpoints, and therefore does not need to advertise the multitude of
network policies that frequently run on an aggregated link interior to the LAN.