<s>
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
Server	I-Protocol
(	O
formerly	O
Microsoft	B-Protocol
Office	I-Protocol
Communications	I-Protocol
Server	I-Protocol
and	O
Microsoft	B-Protocol
Lync	I-Protocol
Server	I-Protocol
)	O
is	O
real-time	O
communications	O
server	B-Application
software	I-Application
that	O
provides	O
the	O
infrastructure	O
for	O
enterprise	O
instant	B-Application
messaging	I-Application
,	O
presence	B-Protocol
,	O
VoIP	B-Application
,	O
ad	O
hoc	O
and	O
structured	O
conferences	O
(	O
audio	O
,	O
video	B-Application
and	O
web	B-Protocol
conferencing	I-Protocol
)	O
and	O
PSTN	O
connectivity	O
through	O
a	O
third-party	O
gateway	O
or	O
SIP	B-Application
trunk	O
.	O
</s>
<s>
These	O
features	O
are	O
available	O
within	O
an	O
organization	O
,	O
between	O
organizations	O
and	O
with	O
external	O
users	O
on	O
the	O
public	O
internet	O
or	O
standard	O
phones	O
(	O
on	O
the	O
PSTN	O
as	O
well	O
as	O
SIP	B-Application
trunking	O
)	O
.	O
</s>
<s>
One	O
basic	O
use	O
of	O
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
Server	I-Protocol
is	O
instant	B-Application
messaging	I-Application
(	O
IM	O
)	O
and	O
presence	B-Protocol
within	O
a	O
single	O
organization	O
.	O
</s>
<s>
This	O
includes	O
support	O
for	O
rich	O
presence	B-Protocol
information	I-Protocol
,	O
file	B-Protocol
transfer	I-Protocol
and	O
voice	O
and	O
video	B-Application
communication	O
.	O
</s>
<s>
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
Server	I-Protocol
uses	O
Interactive	O
Connectivity	O
Establishment	O
for	O
NAT	B-Protocol
traversal	O
and	O
TLS	B-Protocol
encryption	I-Protocol
to	O
enable	O
secure	O
voice	O
and	O
video	B-Application
both	O
inside	O
and	O
outside	O
the	O
corporate	O
network	O
.	O
</s>
<s>
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
Server	I-Protocol
also	O
supports	O
remote	O
users	O
,	O
both	O
corporate	O
users	O
on	O
the	O
Internet	O
(	O
e.g.	O
</s>
<s>
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
supports	O
identity	O
federation	O
,	O
enabling	O
interoperability	O
with	O
other	O
corporate	O
IM	O
networks	O
.	O
</s>
<s>
Federation	O
can	O
be	O
configured	O
either	O
manually	O
(	O
where	O
each	O
partner	O
manually	O
configures	O
the	O
relevant	O
edge	O
servers	O
in	O
the	O
other	O
organization	O
)	O
or	O
automatically	O
(	O
using	O
the	O
appropriate	O
SRV	B-Protocol
records	I-Protocol
in	O
the	O
DNS	B-Protocol
)	O
.	O
</s>
<s>
Microsoft	O
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
Server	I-Protocol
uses	O
Session	B-Application
Initiation	I-Application
Protocol	I-Application
(	O
SIP	B-Application
)	O
for	O
signaling	O
along	O
with	O
the	O
SIMPLE	O
extensions	O
to	O
SIP	B-Application
for	O
IM	O
and	O
presence	B-Protocol
.	O
</s>
<s>
Media	O
is	O
transferred	O
using	O
RTP	B-Protocol
and	O
SRTP	B-Protocol
.	O
</s>
<s>
The	O
live	O
meeting	O
client	B-Protocol
uses	O
Persistent	O
Shared	O
Object	O
Model	O
(	O
PSOM	O
)	O
to	O
download	O
meeting	O
content	O
.	O
</s>
<s>
The	O
communicator	O
client	B-Protocol
also	O
uses	O
HTTPS	B-Protocol
to	O
connect	O
with	O
the	O
web	O
components	O
server	B-Application
to	O
download	O
address	O
books	O
and	O
expand	O
distribution	O
lists	O
.	O
</s>
<s>
By	O
default	O
,	O
supported	O
combinations	O
include	O
encrypted	O
communications	O
using	O
SIP	B-Application
over	O
TLS	B-Protocol
and	O
SRTP	B-Protocol
as	O
well	O
as	O
unencrypted	O
SIP	B-Application
over	O
TCP	B-Protocol
and	O
RTP	B-Protocol
.	O
</s>
<s>
IM	O
is	O
only	O
one	O
portion	O
of	O
the	O
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
suite	O
.	O
</s>
<s>
The	O
other	O
major	O
components	O
are	O
VoIP	B-Application
telephony	I-Application
and	O
video	B-Application
conferencing	I-Application
through	O
the	O
desktop	O
communicator	O
client	B-Protocol
.	O
</s>
<s>
Several	O
third	O
parties	O
have	O
incorporated	O
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
functionality	O
on	O
existing	O
platforms	O
.	O
</s>
<s>
HP	O
has	O
implemented	O
it	O
on	O
its	O
Halo	O
video	B-Application
conferencing	I-Application
platform	O
.	O
</s>
<s>
When	O
Microsoft	B-Protocol
Office	I-Protocol
Live	I-Protocol
Communications	I-Protocol
Server	I-Protocol
was	O
originally	O
launched	O
on	O
29	O
December	O
2003	O
,	O
it	O
replaced	O
the	O
Exchange	B-Operating_System
Instant	B-Application
Messenger	I-Application
Service	O
that	O
had	O
been	O
included	O
in	O
Exchange	B-Operating_System
2000	O
,	O
but	O
which	O
was	O
removed	O
from	O
the	O
Exchange	B-Operating_System
2003	O
feature	O
set	O
.	O
</s>
<s>
Holders	O
of	O
Exchange	B-Operating_System
2000	O
licenses	O
which	O
included	O
Software	O
Assurance	O
were	O
entitled	O
to	O
receive	O
Live	B-Protocol
Communications	I-Protocol
Server	I-Protocol
as	O
an	O
upgrade	O
,	O
along	O
with	O
Exchange	B-Operating_System
2003	O
;	O
however	O
,	O
Live	B-Protocol
Communications	I-Protocol
Server	I-Protocol
Client	B-License
Access	I-License
Licenses	I-License
were	O
purchased	O
as	O
normal	O
for	O
new	O
users	O
.	O
</s>
<s>
OCS	O
R2	O
was	O
announced	O
at	O
VoiceCon	O
in	O
Amsterdam	O
in	O
October	O
2008	O
,	O
a	O
year	O
after	O
releasing	O
Office	B-Protocol
Communications	I-Protocol
Server	I-Protocol
2007	O
.	O
</s>
<s>
Microsoft	O
released	O
Microsoft	B-Protocol
Office	I-Protocol
Communications	I-Protocol
Server	I-Protocol
2007	I-Protocol
R2	I-Protocol
in	O
February	O
2009	O
.	O
</s>
<s>
Microsoft	B-Protocol
Lync	I-Protocol
Server	I-Protocol
2010	O
reached	O
general	O
availability	O
in	O
November	O
2010	O
.	O
</s>
<s>
Microsoft	B-Protocol
Lync	I-Protocol
2013	O
was	O
released	O
to	O
manufacturing	O
in	O
October	O
2012	O
with	O
SP1	O
being	O
released	O
in	O
March	O
2014	O
.	O
</s>
<s>
In	O
2015	O
,	O
the	O
new	O
version	O
of	O
Lync	O
became	O
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
with	O
a	O
new	O
client	B-Protocol
experience	O
,	O
new	O
server	B-Application
release	O
and	O
updates	O
to	O
the	O
service	O
in	O
Office	B-Operating_System
365	I-Operating_System
.	O
</s>
<s>
Microsoft	O
has	O
stated	O
that	O
general	O
availability	O
for	O
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
Server	I-Protocol
2019	O
is	O
targeted	O
for	O
the	O
end	O
of	O
2018	O
.	O
</s>
<s>
Microsoft	B-Protocol
Lync	I-Protocol
is	O
the	O
primary	O
client	B-Protocol
application	I-Protocol
released	O
with	O
Lync	B-Protocol
Server	I-Protocol
.	O
</s>
<s>
This	O
client	B-Protocol
is	O
used	O
for	O
IM	O
,	O
presence	B-Protocol
,	O
voice	O
and	O
video	B-Application
calls	I-Application
,	O
desktop	O
sharing	O
,	O
file	B-Protocol
transfer	I-Protocol
and	O
ad	O
hoc	O
conferences	O
.	O
</s>
<s>
With	O
Lync	O
2013	O
there	O
will	O
be	O
a	O
release	O
of	O
Lync	O
Light	O
Client	B-Protocol
with	O
fewer	O
features	O
.	O
</s>
<s>
Persistent	O
Group	O
Chat	O
functionality	O
(	O
introduced	O
with	O
Lync	B-Protocol
Server	I-Protocol
2010	O
)	O
is	O
only	O
supported	O
on	O
the	O
Windows	B-Application
OS	I-Application
client	B-Protocol
at	O
this	O
time	O
.	O
</s>
<s>
This	O
requires	O
an	O
additional	O
server	B-Application
or	O
multiple	O
servers	O
for	O
processing	O
group	O
chat	O
transactions	O
.	O
</s>
<s>
Other	O
client	B-Protocol
software	I-Protocol
and	O
devices	O
include	O
:	O
</s>
<s>
Lync	O
Mobile	O
is	O
a	O
mobile	O
edition	O
of	O
the	O
Lync	B-Protocol
Server	I-Protocol
2010	O
client	B-Protocol
that	O
offers	O
similar	O
functionality	O
,	O
including	O
voice	O
calls	O
via	O
the	O
GSM	O
network	O
,	O
instant	B-Application
messaging	I-Application
,	O
presence	B-Protocol
and	O
single	O
number	O
reachability	O
.	O
</s>
<s>
New	O
releases	O
of	O
Lync	O
Mobile	O
2013	O
(	O
Wave	O
2	O
)	O
are	O
anticipated	O
,	O
bringing	O
features	O
such	O
as	O
collaboration	O
and	O
voice	O
and	O
video	B-Application
over	O
IP	O
.	O
</s>
<s>
Microsoft	B-Algorithm
RoundTable	I-Algorithm
is	O
an	O
audio	O
and	O
video	B-Application
conferencing	I-Application
device	O
that	O
provides	O
a	O
360-degree	O
view	O
of	O
the	O
conference	O
room	O
and	O
tracks	O
the	O
various	O
speakers	O
.	O
</s>
<s>
The	O
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
client	B-Protocol
is	O
supported	O
by	O
Lync	B-Protocol
Server	I-Protocol
2013	O
,	O
as	O
well	O
as	O
Skype	B-Protocol
for	I-Protocol
Business	I-Protocol
Server	I-Protocol
.	O
</s>
<s>
LG-Nortel	B-Protocol
and	O
Polycom	O
also	O
make	O
IP	O
phones	O
in	O
a	O
traditional	O
phone	O
form	O
factor	O
that	O
operate	O
an	O
embedded	O
edition	O
of	O
Office	B-Protocol
Communicator	I-Protocol
2007	O
.	O
</s>
<s>
Aastra	O
and	O
other	O
vendors	O
offer	O
IP	O
Desk	O
Phones	O
Optimized	O
for	O
Microsoft	B-Protocol
Lync	I-Protocol
.	O
</s>
<s>
It	O
provides	O
chat	O
,	O
voice	O
,	O
file	B-Protocol
transfer	I-Protocol
,	O
video	B-Application
,	O
and	O
desktop	O
sharing	O
functions	O
.	O
</s>
<s>
Fisil	O
makes	O
the	O
only	O
available	O
supported	O
Linux	O
client	B-Protocol
for	O
Lync	O
.	O
</s>
<s>
The	O
unifiedme.co.uk	O
reference	O
lists	O
a	O
Pidgin-based	O
workaround	O
,	O
but	O
according	O
to	O
the	O
information	O
at	O
CERN	O
,	O
it	O
has	O
important	O
limitations	O
.	O
</s>
<s>
The	O
Damaka	O
reference	O
leads	O
to	O
the	O
Google+	O
main	O
page	O
and	O
has	O
no	O
information	O
on	O
a	O
Linux	O
client	B-Protocol
that	O
I	O
could	O
find	O
.	O
</s>
<s>
Lync	B-Protocol
Server	I-Protocol
also	O
has	O
the	O
capability	O
to	O
log	O
and	O
archive	O
all	O
instant	B-Application
message	I-Application
traffic	O
passing	O
through	O
the	O
server	B-Application
and	O
to	O
create	O
Call	O
Detail	O
Records	O
for	O
conferences	O
and	O
voice	O
.	O
</s>
<s>
The	O
Archiving	O
server	B-Application
is	O
not	O
an	O
overall	O
end-to-end	O
compliance	O
solution	O
,	O
as	O
archiving	O
requires	O
you	O
to	O
install	O
the	O
Archiving	O
Server	B-Application
and	O
to	O
configure	O
front	O
end	O
servers	O
accordingly	O
.	O
</s>
<s>
Lync	B-Protocol
Server	I-Protocol
also	O
enables	O
organizations	O
to	O
interoperate	O
with	O
four	O
external	O
IM	O
services	O
:	O
AOL	B-Protocol
Instant	I-Protocol
Messenger	I-Protocol
,	O
Microsoft	O
Messenger	O
service	O
,	O
Yahoo	B-Application
!	I-Application
</s>
<s>
Messenger	O
,	O
and	O
Google	B-Application
Talk	I-Application
.	O
</s>
<s>
PIC	O
was	O
first	O
introduced	O
with	O
Service	O
Pack	O
1	O
for	O
Live	B-Protocol
Communications	I-Protocol
Server	I-Protocol
2005	I-Protocol
,	O
PIC	O
is	O
licensed	O
separately	O
for	O
Yahoo	B-Application
,	O
but	O
is	O
free	O
for	O
AOL	O
and	O
Messenger	O
service	O
for	O
customers	O
with	O
Software	O
Assurance	O
.	O
</s>
<s>
,	O
the	O
third-party	O
SIPE	O
plugin	O
enables	O
third-party	O
clients	O
such	O
as	O
Pidgin	B-Protocol
,	O
Adium	B-Protocol
and	O
Miranda	B-Protocol
NG	I-Protocol
as	O
well	O
as	O
clients	O
using	O
the	O
Telepathy	B-Protocol
framework	O
to	O
support	O
MS	B-Protocol
Lync	I-Protocol
Servers	O
with	O
some	O
limitation	O
(	O
Audio	O
but	O
no	O
SRTP	B-Protocol
,	O
No	O
Video	B-Application
)	O
via	O
the	O
extended	O
version	O
of	O
SIP/SIMPLE	O
.	O
</s>
<s>
Lync	B-Protocol
Server	I-Protocol
has	O
an	O
XMPP	B-Protocol
gateway	O
server	B-Application
to	O
federate	O
with	O
external	O
XMPP	B-Protocol
servers	O
.	O
</s>
<s>
With	O
Lync	B-Protocol
Server	I-Protocol
2013	O
,	O
XMPP	B-Protocol
is	O
natively	O
part	O
of	O
the	O
product	O
.	O
</s>
<s>
The	O
ejabberd	B-Protocol
XMPP	B-Protocol
server	B-Application
has	O
a	O
bridge	O
that	O
enables	O
federation	O
with	O
OCS	O
servers	O
,	O
without	O
gateways	O
(	O
transports	O
)	O
.	O
</s>
<s>
Competitors	O
to	O
Lync	B-Protocol
Server	I-Protocol
include	O
:	O
</s>
<s>
In	O
instant	B-Application
messaging	I-Application
,	O
the	O
free	O
public	O
instant	B-Application
messaging	I-Application
networks	O
(	O
Google	O
,	O
Live	O
Messenger	O
,	O
Yahoo	B-Application
and	O
AOL	O
)	O
are	O
widely	O
used	O
and	O
represent	O
a	O
degree	O
of	O
competition	O
.	O
</s>
<s>
There	O
have	O
been	O
attempts	O
by	O
other	O
vendors	O
at	O
providing	O
solutions	O
such	O
as	O
Yahoo	B-Application
!	I-Application
</s>
<s>
'	O
s	O
Enterprise	O
Instant	B-Application
Messenger	I-Application
;	O
however	O
these	O
attempts	O
have	O
been	O
largely	O
unsuccessful	O
.	O
</s>
<s>
An	O
ICQ	B-Protocol
corporate	O
client	B-Protocol
and	O
server	B-Application
option	O
once	O
existed	O
,	O
but	O
it	O
is	O
no	O
longer	O
supported	O
or	O
developed	O
.	O
</s>
<s>
Products	O
such	O
as	O
Cisco	O
Unified	O
Presence	B-Protocol
Server	B-Application
(	O
Version	O
6.0.2	O
+	O
)	O
support	O
federation	O
with	O
Microsoft	O
Office	O
Communication	O
Server	B-Application
2007	O
to	O
provide	O
presence	B-Protocol
of	O
Cisco	O
IP	O
phones	O
and	O
remote	O
call	O
control	O
of	O
the	O
IP	O
phone	O
from	O
the	O
Microsoft	B-Protocol
Office	I-Protocol
Communicator	I-Protocol
client	B-Protocol
.	O
</s>
<s>
The	O
Siemens	O
OpenScape	O
solution	O
offers	O
a	O
federation	O
with	O
the	O
Office	B-Protocol
communicator	I-Protocol
,	O
and	O
also	O
an	O
integration	O
into	O
the	O
office	B-Protocol
communicator	I-Protocol
,	O
allowing	O
to	O
use	O
the	O
standard	O
functionalities	O
of	O
the	O
office	O
communication	O
suite	O
together	O
with	O
the	O
SIP	B-Application
based	O
voice	O
functionalities	O
of	O
the	O
Siemens	O
platform	O
.	O
</s>
<s>
The	O
Asterisk	B-Language
telephone	O
platform	O
supports	O
SIP	B-Application
,	O
IAX	B-Protocol
,	O
and	O
ISDN	B-Protocol
connections	O
.	O
</s>
<s>
Most	O
telephones	O
that	O
support	O
these	O
protocols	O
may	O
be	O
used	O
with	O
Asterisk	B-Language
,	O
including	O
software	O
phone	O
clients	O
.	O
</s>
