112
Additional code – Example: 1320300003.
Emergency
Call
Service
Emergency Call Service (e.g., E911 and others), such as defined by TIA or NENA.
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:
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:
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
