8th May 2003
Latest Software releases provide a number
of new features and functionalities
VegaStream's latest software releases, 5 and 5.1, provide a
number of new features and functionality, highlights of which
include the provision of a new interface, CAS, feature
transparency with QSIG tunnelling and Quality of Service
(QoS) performance parameters.
Channel Associated Signalling (CAS) Robbed-Bit Signalling
(RBS) is applicable primarily to the North American market
and implementation of this interface greatly extends the
applicability of VegaStream's gateways in the customer's
network. Available on the Vega 100 T1 product, CAS
functionality was originally made available in H.323 Release
5 (E&M Feature Group B with DTMF only). Release 5.1 brings
Feature Group D, FXS Ground Start, FXS Loop Start with full
support for MF and DTMF dialling modes and is available for
both the H.323 and SIP builds.
QSIG Tunnelling (H.323 only)
QSIG tunnelling enables the IP network to act as an Intervening
Network (IVN) in a Private ISDN network (PISN). QSIG feature
messages are tunnelled across the IVN in H.323 messages and
are unbundled at the far end, unchanged. Hence, QSIG features
will work transparently, almost as if the H.323 network were not
The first step towards QSIG feature transparency was taken in
H.323 Release 4, with the provision of ISO QSIG Basic Call. In
H.323 Release 5, the tunnelling of QSIG features was implemented
according to ECMA-333, Mapping Functions for the Tunnelling of
QSIG through H.323 Networks, (ISO/IEC 23290).
Quality of Service (QoS)
A number of new features are introduced to enable quality of
service (QoS) precedence parameters to be set for the IP packet.
These new features are:
Type of Service (ToS) (IETF RFC 1349)
Differentiated Services (DiffServ) (IETF RFC 2474/2475)
802.1p (Part of IEE 802.1D, Media access control (MAC) Bridges)
802.1Q (IEEE, Virtual Bridged Local Area Networks)
Radius accounting is defined by the IETF (RFCs 2865/2866) and
enables accounting information to be transmitted to a central
accounting server. The addresses (DNS or IP address) of up to
five Radius servers may be provisioned in the gateway. To
ensure the security of the accounting information, encryption
is supported and a unique encryption key may be provisioned
for each Radius server.
Enhancements to the SIP Product
In addition to UDP, SIP is now supported over TCP, to ensure
maximum compatibility with other manufacturers.
Additional SIP message support: Addition of transmission of
"183 Session progress" message
Many other improvements have been introduced in the
The "SHOW" command displays configuration changes from
the default E1 Short haul/long haul: Allows the attenuation for
a link to be configured - < or > 6dB
Overall voice quality - 'hairpinning' of calls transferred back to
the TDM interface; configurable play-through of TDM-side media;
Performance and measurement - Additional diagnostic filters;
enhancements to the DHCP implementation; introduction of
packet load monitoring.