AVAYA IP Office can provide support of traditional analogue and digital telephones in any mix creating a traditional PABX or Telephone system. Through the support of IP Phones, combined with the systems inherent gatekeeper and gateway functionality, IP Office can provide a 100% IP telephony solution or a hybrid of both the traditional and IP worlds.
With a conventional telephone system you plug your analogue or digital telephone into an extension socket connected to your PBX or Key System. With IP Telephony you connect your telephone to your IP PBX via the LAN. There are two basic types of IP phones:
IP telephony has the advantage of allowing extensions to be deployed both locally and remotely through the use of routers or VPN services. When making use of IP Extensions, quality of service should not be ignored. In situations where more than eight IP extensions are required or where LAN Bandwidth is limited, a quality of service capable LAN switch, such as the AVAYA’s P130, should be used.
H.323 Architecture comprises of four logical components
These four devices types are grouped together in what is known as an H.323 zone (a zone is analogous to a PABX). Each zone has a single Gatekeeper that can be considered as the brains of the system dealing with call distribution, call control and the management of resources. On power up, terminals, Gateways and MCUs make a registration request against a Gatekeeper who authenticates, accepts or rejects their request to become a member of the zone. Once accepted, a terminal wishing to make a call sends a call set-up message to the Gatekeeper who will then send an alert to the called party or if the call is to a non-H.323 terminal establish the call via a Gateway.
The design of IP Telephony systems has been driven with open standards in mind. IP Phones,
Gateways & Gatekeepers all support the H.323 standard and it is this that allows devices from different manufacturers to work together. IP Office has the integral Gateway and Gatekeeper functionality required to provide a fully functional IP Telephony environment.
The 4602 supports the following features:
IP Office also supports the 4602SW, which includes all of the above features plus an integrated Ethernet switch for PC connection.
In addition to the features of the 4602/4602SW the 4620 supports the following:
IP Office’s PhoneManager Pro can be configured to operate as an IP Soft Phone – iPhoneManager Pro’ by use of a license key. As with PhoneManager Pro the iPhoneManager Pro offers the same GUI interface for the user to take control of making and receiving telephone calls. Like PhoneManager Pro, iPhoneManager Pro communicates with the IP Office system unit via the LAN. The difference is that there is no physical terminal and conversation actually takes place via the PC’s soundcard.
The physical set up can include a headset/microphone connected to the PC’s soundcard or USB port. iPhone Manager Pro has the significant advantage for mobile users with remote access to the LAN, providing ‘a phone within their laptop’.
Note: iPhoneManager Pro runs on a multi-media PC using Windows 2000 and Windows XP operating systems.
Leveraging the reliable technology from Spectra-Link, a leader in wireless voice solutions for the workplace, the AVAYA IP Wireless Solution offers an advanced voice over IP (VoIP) client for wireless networks. This solution allows SME’s to take advantage of the cost savings and simplified management of a converged voice and data infrastructure.
Both the 3616 and 3626 phones are optimized for AVAYA IP telephony and emulate the wired 4606 IP Telephone. They work in conjunction with the AVAYA Voice Priority Processor to ensure voice quality over Wireless LANs. They are field-upgradeable through an integrated TFTP client, so handsets can be updated with new protocols, features, and capabilities as they become available.
Based on global standards for wireless LANs, the AVAYA’s IP Wireless Telephone Solution simplifies network infrastructure by enabling voice traffic to be carried along with data traffic over the same wireless network. Both the 3616 and 3626 telephones are available for direct sequence 802.11b Wi-Fi networks. The Spectra-Link Voice Priority (SVP) quality of service protocol is simple to implement and reduces packet queuing delays for voice traffic. Spectra-Link Voice Priority-enabled access points are available from the leading providers of enterprise wireless networks such as AVAYA.
Users can have a choice of an executive or rugged workplace telephone and all the productivity benefits of their desk telephone in this next generation of wireless telephone solutions
To enhance voice quality over the wireless network, Spectra-Link has developed a Quality of Service (QoS) mechanism that is implemented in the wireless telephone and access point.
The AWTS Open Application Interface (OAI) Gateway enables third- party software applications to communicate with the AVAYA IP Wireless Telephones. This serves as a two-way messaging device. Many companies provide applications that interface to your in-house paging systems, email, and client-server messaging. Other vendors with complementary systems such as nurse call, telemetry, alarm, and control system manufacturers are currently developing applications to interface with the AVAYA IP Wireless Telephone solution.
The AVAYA 3616 IP Wireless Telephone is designed for more general enterprise applications and uses a compact, cell phone-like form factor.
The 3616 supports the following features:
The AVAYA 3626 Wireless Telephone is designed specifically for use in commercial workplace applications. It is extremely durable and has no moving parts, no external antenna, and no complex configuration menus. The handset has a rugged, monolithic design that gives users a large earpiece to provide comfort and seal out background noise.
The 3626 supports all of the features of 3616 with the following differences:
The Integral IP Office gatekeeper allows the registration of up to 360 IP extensions, less the number of traditional analogue and digital telephones.
IP Office fitted with a Voice Compression Module allows IP extensions to make calls to other non-IP devices. The maximum number of simultaneous calls is limited by the number of channels available on the Voice Compression Module. Refer to Section 2 for the number of channels supported on each of the platforms.
Silence suppression is a technique used to make the best use of available bandwidth. Silence suppression works by sending descriptions of the background noise, rather than the actual noise itself, during gaps in conversation thereby reducing the packet size needed. Background noise is very important during a telephone call. Without noise the call will feel very unnatural and give a perception of poor quality.
IP Office supports a wide range of voice compression standards including G.711, G.723.1 and G.729a. The method of compression can be either automatically established on a call-by-call basis or be configured on an individual extension basis.
When supported by an IP extension, this facility reduces the protocol overhead allowing an audio path to be established quicker on answering a call.
This facility allows the choice of providing music from the IP Office, which obviously uses bandwidth on the LAN, or allowing the IP endpoint to generate its own.
This facility allows the choice of providing call supervision tones from the IP Office, which obviously uses bandwidth on the LAN, or allowing the IP endpoint to generate its own.
When configured, IP Office will generate DTMF tones on behalf of an IP extension. This is useful when navigating external voicemail systems and Auto-Attendants.
Direct Media Path allows the speech path between two IP extensions (after call setup) to be routed directly to each other. This allows the IP Office system to free voice compression resources allowing them to be used in the most efficient way.
This facility allows IP Office to automatically create an extension entry for new extensions added onto the local area network. In cases where the local area network is not secure this facility can be disabled.
AVAYA IP Office supports a wide variety of voice and data networking options from traditional public circuit switched networks and structured leased circuits to a multitude of packetised voice solutions. This section describes the options available for businesses who are ready to embrace packetised voice solutions such as Voice over IP (VoIP).
Packet based voice networking between IP Office sites can be achieved in a number of ways:
Private voice networks can be constructed making use of available unstructured data circuits (X.21, V.35) at speeds of up to 2 Mbits. These data circuits are accessed via IP Offices equipped with an optional Voice Compression Module (VCM), providing from 2 to 60 VoIP calls depending on IP Office model. This approach can realize significant savings by allowing compressed VoIP calls to be interleaved with data on any leased circuit with spare bandwidth.
Where multiple sites exist, the addition of the ‘IP400 Office WAN3’ Module allows larger networks to be designed. Two Modules can be supported on a single system providing a total of 7 leased lines.
Frame Relay is a high-speed, packet switching WAN protocol that enables the interconnection of geographically dispersed LANs. Frame relay is usually offered as a service by a public network provider. However, some private organizations can also own and manage their own Frame Relay networks.
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, 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 bearer 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.
Even though the IP Office operates as a traditional ‘circuit switched telephone system’ utilizing standard analogue and digital handsets, the inclusion of an integrated Voice over IP (VoIP) Gateway allows significant cost savings to be realized by converging voice and data onto a single managed IP VPN.
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.
IP VPN’s have some distinct advantages over Frame Relay networks: access bandwidth need not be pre-allocated between sites like Frame Relay’s PVCs, they are generally cheaper and their global reach is normally greater. Access to the IP VPN is via one of IP Office’s LAN ports.
In a factory or campus environment, voice calls can also be linked utilizing 10/100 Mbps LAN connections, which can be copper or fibre. This is again facilitated by the optional Voice Compression Module (VCM). In order to avoid bandwidth issues VoIP across the LAN will require some form of bandwidth management. AVAYA’s Cajun switches are the recommended option for this.
Traditional circuit switched telephony over the public telephone network is restricted in the level of feature support that can be offered. By deploying VoIP over T1/E1/PRI, IP Office is unique in realizing the benefits of Q.931 and H.450 supplementary service support.