IP Telephony Features
Office gatekeeper allows the registration of up to 384 IP extensions on the
IP500, less the number
analog and digital TDM telephones already configured on the system.
Voice Compression Module provides the H.323 gateway function that allows IP
extensions to make
to other non-IP devices. The maximum number of simultaneous calls is limited by
the number of
available on the Voice Compression Module. IP Office must be fitted with an
Module to enable IP telephony.
suppression is a technique used to make the best use of available bandwidth,
such as the
over which the caller is listening, not speaking. Silence suppression works by
of the background noise, rather than the actual noise itself, during gaps in
reducing the number and frequency of voice packets sent on the network.
Background noise is
important during a telephone call. Without noise the call will feel very
unnatural and give a
of poor quality.
Office supports a wide range of voice compression standards including G.711,
G.729a and G.723.1.
method of compression can be either automatically established on a call-by-call
basis or be
on an individual extension basis.
fast start is supported by an IP extension, this facility reduces the protocol
overhead allowing an
path to be established more quickly.
out of Band DTMF is configured on an IP extension, the extension will signal to
the other end of the
which digits need to be regenerated by a local DTMF generator on behalf of the
This is useful when navigating external voicemail systems and Auto-Attendants.
Media Path allows the speech path between two IP extensions (after call setup)
to be routed
to each other. This allows the IP Office system to free up voice compression
the end to end connection, allowing the resources to be used in the most
Office can automatically create an extension entry for new IP telephones added
onto the local area
In cases where the local area network is not secure this facility can be
disabled, but simplifies
of IP telephone systems
Transport (Avaya Proprietary)
Transport allows fax calls to be routed over VoIP trunks between IP Office
systems on an IP network
a proprietary IP Office transport protocol.
Office supports the standardized protocol "T.38" for transporting FAX
calls between IP Office and SIP
or SIP endpoints. T.38 is only supported on IP Office 500 hardware. It requires
the IP Office to be
with VCM 32 or VCM 64 modules.
allows the reliable transmission of Fax messages over a IP channel independent
of Codec used for
Supported: IP500, IP500 V2 only, must be fitted with VCM32
Types Supported: SIP
Transport Layers Supported: UDPTL (with optional redundancy error
Versions Supported: 0-3
Types Supported: Voice calls which transition to fax relay on detection
which are negotiated as fax only