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IP Office Product Description

IP Office 4.2

Page 129

Issue 18.b.- (08 July 2008)

IP Office Turns VoIP into IP Telephony

In order to make use of VoIP, IP Office uses signaling protocols called H.323 right now, and Session Initiation

Protocol (SIP) which allow IP Office to establish end-to-end connections for the voice path through the IP

network. It ensures each end of the connection is able to transmit and receive voice and provides the network

addressing for end to end packet transmission. IP Office also allows for connecting between the different

technologies by translating the signals they use, for example an analog phone may wish to connect to a VoIP

destination. This requires both the signaling and voice transmission to be translated – IP Office does this easily

as it contains technology elements called gateways and gatekeepers that enable translations to happen.

With a conventional telephone system you plug your analog or digital TDM telephone into an extension socket

connected to your PBX or Key System. With IP Telephony you connect your digital IP telephone to your IP PBX

via the LAN. There are two basic types of IP phones:

· A physical phone, which looks very similar to a standard telephone (IP Hard Phone)

· A software application (Phone Manager PC Softphone) which runs on the user's PC, allowing them to use

either a headset/microphone to make/receive calls anywhere they have IP connection

IP telephony has the advantage of allowing extensions to be deployed both locally and remotely through the

use of IP routing and IP VPN services.

When making use of IP telephony, there are a number of data centric considerations such as which data types

have priority on the IP network when there is contention. This is set with IP/TCP “quality of service” and

should not be ignored. In situations where LAN Bandwidth is limited, a quality of service capable LAN switch

should be used to ensure voice packets are transmitted with the required priority on the network. If not, the

conversation carried over IP appears as broken up (due to packet loss) or has unacceptable delays introduced

in the conversation (latency andjitter). With IP hardphones there is need for Power over Ethernet (PoE) or

“midspan power” to be provided to the phones as the IP phones are no longer powered by IP Office – a list of

Avaya approved PoE options is available at the end of this section.

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Reliant Octel 300 Spezifikationen Seite 129