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Chapter 4 - Operation and Administration
but only forwarded to the Access Concentrator. In the downlink, broadcasts are
allowed only in cases of unknown addresses.
4.10.1.2.3
Voice Service
The Voice over IP (VoIP) service provides telephony services through an externa
Voice Gateway connected to the Subscriber Unit's data port. The VoIP service is
designed for Alvar
protocol to identify VoIP sessions and to verify optimal handling of these sessions.
Upon provisioning of such a service, the system automatically handles Signaling
and RTP connections establishment, including QoS issues.
NOTE
The DRAP-based Voice Service is also available when an L2 Service is provisioned.
DRAP (Dynamic Resources Allocation Protocol) is a protocol between the Gate
(installed behind the Subscriber Unit) and the base station. The protocol prov
an auto-discovery mechanism for the Gateway, so that no specific configuration
is needed
station. The protocol uses a few simple messages enabling a Voice Gateway to
request resources when calls are made, and the base st
allocate them.
Using the DRAP solution has the following advantages:
Maintain t
allocate C
QoS and low jitte
Allocate
allocated an
the VoIP signal
resources.
Prevent callers from
control and limit the ma
and per end user voice
network and the
Automatic s
update the
bandwidth allocation change during the call, hence the exact required
bandwidth is always provide
call might begin with one Codec and switch to another to accommodate the
fax transmission.
152
ion's Voice Gateways, using the proprietary DRAP signaling
and the Gateway can automatically locate and register with the base
elephony toll quality over the wireless network – dynamically
ontinuous Grant (CG) connections for active calls, maintaining the
r needed for toll-quality voice services.
CG bandwidth only for the duration of the call – the air resources are
d released according to the DRAP messages, which are based on
ing. This dynamic allocation ensures efficient use of the air
placing calls if a sector is overloaded – the operator can
ximum number of concurrent calls per wireless sector
gateway. Thus, the operator has complete control of its
resources in it.
upport of Codec changing in a VoIP call – the DRAP messages
BreezeMAX equipment on any Codec change or subsequent
d. This is essential in fax transmissions where the
way
ation to dynamically
BreezeMAX System Manual
l
ides
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