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52 Avaya Application Solutions IP Telephony Deployment Guide
- SYN cookies, which protect against a well-known TCP/IP attack in which a malicious
attacker targets a vulnerable device and effectively prevents it from establishing new
TCP connections.
Alarms and troubleshooting features
The G450 has extensive features for error detection, alarms, and troubleshooting. Detailed
diagnostic information and troubleshooting are provided by software-based solutions accessible
by laptop computers in the field or remotely from an administrator’s computer. Administration for
the Avaya G450 Media Gateway, 03-602055, provides a comprehensive guide to configuring
and using these solutions.
Converged Network Analyzer (CNA) test plug
CNA test plugs are a component of CNA, a distributed system tool for real-time network
monitoring that detects and diagnoses converged network-related issues. CNA is deployed in the
media gateway to identify any network conditions or impairments that can degrade the user
experience for IP telephony and to monitor overall network performance. Test plugs in media
gateways provide the ability to measure end-to-end service to the edge of the PSTN, or at points
where codec changes are required for interworking between high (LAN) and low (WAN) speed
links.
Link Layer Discovery Protocol (LLDP)
LLDP simplifies network troubleshooting and enhances the ability of network management tools
to discover and maintain accurate network topologies in multi-vendor environments. LLDP
defines a set of advertisement messages (TLVs), a protocol for transmitting the TLVs, and a
method for storing the information contained in the received TLVs. This allows stations attached
to a LAN to advertise information about the system and about the station’s point of attachment
to the LAN to other stations attached to the same LAN. These can be reported to the
management station via SNMP MIBs.
LLDP is supported on the front panel ETH LAN ports.
G250 and G350 Media Gateways
The Avaya G250 and G350 Media Gateways form part of Avaya Enterprise Connect, Avaya’s
solution for extending communication capabilities from the headquarters of an organization to
all collaborative branch locations. Avaya Enterprise Connect helps you provide the same high
quality services to all organization members, regardless of their location.
The G250 and G350 are high-performance converged telephony and networking devices that
are located in small branch locations, providing all infrastructure needs in one box — telephone
exchange and data networking. The G250 and G350 each feature a VoIP engine, WAN router,
and Power-over-Ethernet (PoE) LAN switch. The G350 provides full support for legacy DCP
and analog telephones. The G250 supports legacy analog telephones, but not DCP telephones.