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Most commonly used VoIP protocols:
H.323
Is the ITU umbrella standard for Multimedia Communications (Voice,
Video and Document Sharing) on LAN and WAN. H.323 is the first
and most established VoIP standard. The strong point is interoperability;
the downside is that it is complex and heavy.
SIP:
Session Initiation Protocol
Is the IETF standard with an HTML-like philosophy (text based,
flexible and extensible). SIP is the strategic VoIP protocol for
many vendors and operators. Uses other protocols for Session Description
 MGCP:
Media Gateway Control Protocol
IETF standard for controlling media gateways. MGCP is combined
with "packages" or other protocols for signaling. There
are many derivatives (NCS, H.248, MEGACO, SIGTRAN). MGCP is mostly
used in carrier/provider networks with centralized control (softswitch
networks).
Download
Patton Application Note (PDF File 351KB)
Products
 PSTN
Analogue
Analogue VoIP gateways are the simple to install and can be used
with all types of analogue phones and PBX to provide low cost
IP telephony for the SOHO market. For a single user working from
home with an ADSL Broadband the IPCallBox Personal and Residential
operate with the existing PSTN Phones.
Download
'The Broadband Office' (PDF File 204KB)
 Planet
VoIP products are available with multiple telephone ports for
small or branch offices.
Download
Product Details (PDF File 120KB)
ISDN
BRI (Basic Rate Interface)
 Connecting
to standard BRI ports on a PBX up to 8 voice channels can be connected
via an IP Network with 2 ISDN back or alternate routing ports
available. This unit enables single users working from home or
branch offices to have full access to all the main PBX functions
such as Voice Mail, conference calls, etc. (Even lines as low
as 64Kbps can support simultaneous voice and data)
Download
Product Details (PDF File 219KB)
 ISDN
PRI/E1 (Primary Rate Interface)
Are designed to connect digital PBXs together across IP networks
or act as a VoIP Gateway for a large organisation the unit connects
directly to 1 or 2 PRI/E1 ports on a PBX. The units can support
up to 60 voice channels and versions are available for proprietary
PBX signalling protocols such as QSIG, Q931, and DPNSS.
Download
Product Details (PDF File 372KB)
H.323
IP Telephony Gatekeeper
 The
MultiVOIP Gatekeeper is a complementary product to the voice over
IP gateways. This hardware and software solution provides the
power to define and control how H.323 voice traffic is managed
over IP networks.
- Reliable
call control services for registered H.323 endpoints
- Standards
based interoperability
- Robust
bandwidth management for superior QoS
With
the MultiVOIP Gatekeeper, network managers have the ability to
configure, monitor and manage the activity of registered network
endpoints. In addition, managers can set policies and control
network resources, such as bandwidth usage, to ensure optimal
implementation. It also provides seamless interoperability between
PBX dial plans and IP-based terminals. And, it provides call centres
with the ability to perform needs based call routing.
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