<s>
Mscgen	B-Protocol
(	O
short	O
for	O
MSC	O
generator	O
)	O
is	O
a	O
software	O
tool	O
for	O
drawing	O
message	B-Application
sequence	I-Application
charts	I-Application
from	O
a	O
simple	O
to	O
manage	O
text-based	O
source	O
file	O
.	O
</s>
<s>
Rendered	O
charts	O
can	O
be	O
output	O
in	O
PNG	O
,	O
SVG	B-Application
and	O
PostScript	B-Language
,	O
with	O
hyperlink	O
information	O
in	O
ismap	B-General_Concept
format	O
.	O
</s>
<s>
There	O
is	O
an	O
extension	O
for	O
MediaWiki	B-Application
,	O
Sphinx	B-Language
(	O
documentation	O
generator	O
)	O
and	O
integration	O
with	O
Doxygen	B-Language
that	O
allows	O
embedding	O
of	O
charts	O
into	O
source	O
code	O
comments	O
with	O
generated	O
automatically	O
inserted	O
into	O
the	O
generated	O
documentation	O
page	O
.	O
</s>
<s>
Mscgen	B-Protocol
is	O
free	O
software	O
licensed	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
.	O
</s>
<s>
Here	O
are	O
two	O
examples	O
of	O
input	O
and	O
output	O
for	O
some	O
standard	O
SIP	B-Application
message	O
flows	O
:	O
</s>
