• The added line is THIS COLOR.
  • The deleted line is THIS COLOR.

*Whole block [#k30061e1]
It is the modularized layer structure which made the four following things one unit.~
At present, it has only a module relevant to "SIP." ~
In the future, other things are due to be added.

-B2BUA Layer
-UA Layer
-Stack Layer
-Transport Layer

* [#b84de801]