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2 System Description
Chapter 1 - System Description
1.1 Introducing the Voice Gateway
Alvarion's Voice Gateway enables operators and service providers using Alvarion's
Broadband Wireless Access system to provide subscribers with a number of
broadband services transparently. The Voice Gateway enables bundling services
such as telephony (Voice over IP) and high speed Internet to end-users.
IP-telephony services are supported for standard analog phones or G3 fax
machines. The VG-1D1V has a single POTS interface, and the VG-1D2V has two
POTS interfaces. The Voice Gateways are available with either H.323 or SIP
standard, and support both narrow (compressed) and wide band (uncompressed)
speech codecs, silence suppression with comfort noise, line echo cancellation and
regional telephone parameters. Class 5 services such call waiting and 3-party
conference call are also supported.
Up to 3 telephones can be connected in series to each telephone port. Daisy
chaining of Voice Gateways enables the service provider to offer certain end users,
for example small offices, additional telephone numbers.
The Voice Gateway also supports Internet access or any other Ethernet based
services. The unit can be installed behind a router/NAT due to NAT traversal
support allowing signaling as well as voice packets to correctly reach Softswitch or
Gatekeeper for bi-directional call initiations. The Gateway can handle up to 16
simultaneous VLANs, enabling the operator to offer different services to different
end users behind the unit.
These Gateways incorporate the proprietary DRAP (Dynamic Resources Allocation
Protocol) protocol for automatic registration and allocation of resource. DRAP is a
protocol based on IP/UDP between the Gateway and a DRAP server (e.g. the
BreezeMAX base station). The protocol provides an auto-discovery mechanism for
the Gateway, so no specific configuration is required and the Gateway can
automatically locate and register with the DRAP server. The protocol uses a few
simple messages enabling a Voice Gateway to request resources when calls are
made, and the DRAP server to dynamically allocate them.
The Voice Gateways are designed for remote management and supervision using
either the built-in internal web server or SNMP.
The Voice Gateways are easily updated and upgraded as they support remote
software and configuration file download.
For a complete list of new features, refer to Appendix C.