Reliant Octel 300 Spezifikationen PDF herunterladen (Seite 150)

IP Office Product Description

IP Office 4.2

Page 150

Issue 18.b.- (08 July 2008)

VoIP over a Managed Frame Relay Network

Frame Relay is a high-speed, packet switching WAN protocol that enables the interconnection of LANs and is

usually offered as a service by a public network provider. Frame Relay is a connection-oriented protocol, which

means that it relies on an existing end-to-end path between devices connected across the network. It

implements these connections using Permanent Virtual Circuits (PVCs).

Like a leased circuit, a PVC is a logical path that connects two devices. This path between the source and

destination point is a dedicated connection, so the PVC is always available to the connected devices. However,

unlike a leased circuit many PVCs can coexist on a single access circuit which allows devices to share the

bandwidth of a given transmission line.

Voice over a managed Frame Relay network is similar to Voice over a managed IP network except that the

access interface is usually an unstructured leased circuit via IP Office's WAN port. IP Office employs a Frame

Relay Assembler Disassembler (FRAD) to allow voice and data traffic to be formatted and framed for a Frame

Relay network.

VoIP over a Managed IP VPN

Even though IP Office can operate as a pure circuit switched system with analog and digital TDM handsets,

because IP Office includes an integrated Voice over IP (VoIP) Gateway significant cost savings can be made by

sending voice and data over a single managed IP VPN.

IP VPNs have advantages over Frame Relay networks; access bandwidth need not be pre-allocated between

sites like Frame Relay's PVCs and they are generally lower cost and their global reach is normally greater.

Access to the IP VPN is via one of IP Office's WAN ports.

A managed IP network or IP VPN is a private network of routers managed and partitioned by a single network

service provider who assigns IP addresses and manages the network. Because of this, the network service

provider can guarantee throughput levels, minimize latency and ensure transmission speeds to give greater

quality of service supported by a contracted service level agreement. Avaya do not recommend networking IP

Office systems over a unmanaged public IP networks where neither QoS nor service levels can be guaranteed

by the provider.

VoIP across the LAN

In a factory or campus environment, voice calls can sent over 10/100 Mbps LAN connections on systems

equipped with optional Voice Compression Modules (VCM). In order to avoid bandwidth contention issues, VoIP

across the LAN will require some form of bandwidth management through Diffserve.

VoIP networking across the LAN

VoIP across the Public Network

IP Office is capable of realizing the benefits of Q.931 and H.450 supplementary service support across a public

connection where an appropriate QoS connection can be established.

1 2 ... 145 146 147 148 149 150 151 152 153 154 155 ... 335 336

Keine Kommentare

Reliant Octel 300 Spezifikationen Seite 150