Voip mobile or mobile Voice over Internet Protocol' is the application
of voice over IP technology to mobile handsets.
VoIP mobile requires a mobile handset that supports, at minimum,
high speed IP communications. Most commonly this is using Voice
over WiFi or VoWiFi, but the same protocols (typically SIP or
jabber) can be used over any broadband IP-capable wireless network
connection such as the various 3G standards, EVDO rev A (which
is synchronously high speed - both high speed up and down), HSDPA
or potentially WiMax.
VoIP mobile will require a compromise between economy and mobility.
For example, Voice over WiFi offers free service but is only available
within the coverage area of the WiFi Access Point. High speed
services from mobile operators using EVDO rev A or HSPDA with
probably have better audio quality and capabilities for metropolitan-wide
coverage including fast handoffs from mobile base station to another,
yet it will cost more than the typical WiFi-based VoIP service.
VoIP mobile will become an important service in the coming years
as device manufacturers exploit more powerful processors and less
costly memory to meet the users' needs for ever-more 'power in
their pocket'. Smartphones in mid-2006 are capable of sending
and receiving email, browse the web (albeit at low rates) and
in some cases watch TV.
The challenge for the mobile operator industry is to deliver
the benefits and innovations of IP without losing control of the
network service. Users like the Internet to be free and high speed
without extra charges for visiting specific sites versus other
sites. Delivering mobile VoIP is a service that challenges the
most valuable service in the telecommunications industry - voice
- and threatens (or promises, depending on your views) the pace
of innovation in the global communications industry.
There are three main technologies used for mobile VoIP:
UMA - The Unlicensed mobile Access Generic Access Network, designed
to allow VoIP to run over the GSM cellular backbone
SIP - The standard used by most VoIP services, and now being implemented
on mobile handsets
Skype Protocol - a proprietary modified version of Jabber
(truphon - uses all opensource components to build mobile VOIP
VoIP mobile industry is estimated to grow to 12 Billion Dollars
by 2010 in Europe alone. Four are technologies required for mobile
VoIP functionality: devices, client software, wireless networks
and VoIP services.
Throughout the early 2000s, Hewlett-Packard, Symbol Technologies
and others have been innovators in WiFi-based handheld devices,
as Personal digital assistant or handheld computers for warehousing
and other applications. As successive generations of these devices
gained in processing power and battery life, their potential use
as a platform for mobile VoIP became practical. Using Microsoft
Windows CE operating systems, and in the summer of 2005 companies
such as FirstHand Technologies delivered practical client software
to run on these class of WiFi only, Windows-based PDAs.
In the summer of 2006 Nokia introduced a SIP (Session Initiation
Protocol) stack and a VoIP client in the E-series dual-mode WiFi
handsets (E60, E61, E70). These E-series handsets are intended
for business users, but Nokia released a consumer handset, the
N80 Internet edition, in November 2006.
From a Wi-Fi network perspective there are several innovations
that are imbedded into the most current offers of vendors WiFi
networking equipment to enterprise and municipal service providers,
that makes them particularly powerful in a mobile VoIP context.
These innovations include support for strong encryption making
the conversation in a Wi-Fi context quite private (IEEE_802.11i),
support for Quality of Service for real-time services such as
mobile VoIP (see IEEE_802.11e) and in some cases support for wireless
access point to access point call handoff. Vendors leading these
developments include Cisco, Aruba Networks, Trapeze Networks and
VoIP server vendors upon which VoIP service providers create
the service including Nortel, BroadSoft and Sylantro have announced
support, as early as January 2006 for dual-mode phones and the
VoIP client from FirstHand Technologies, known as mobile Console.
Enterprise IP PBX vendors including Siemens, NEC, Nortel, Avaya,
Cisco and others have developed, tested or announced capabilities
for mobile VoIP users interacting with their business IP-based
phone systems. Sylantro Systems has recently experienced high
turnover, including the loss of CTO, CMO, CFO, CEO in the last
few months Broadsoft continues to be gaining in customers, partners
and revenue, and is has indicated their intent to go public.
Fixed mobile convergence brings the mobile VoIP element together
with the public mobile phone service in a way that enables seamless
roaming across these devices. Standards and alliances have been
developed and technologies have been demonstrated as early as
December 2005. Cisco and FirstHand Technologies demonstrated a
WiFi to GSM handoff in San Jose, December 5, 2005.
Recently T-mobile blocked the access to pure mobile VoIP numbers,
which got issued by truphone for the first time. The issue was
widely discussed in the press and truphone won the case in the
UK High Courts.
-ISDN BRI and ISDN PRI Services
-FXO vs FXS
System for Mobile Communications
-SIP:Session Initiation Protocol
-List of commercial voice over IP
-List of SIP software