The wired line network has been well studied and widely used for a long
time. Most of its protocols are so successful that passed the test of time.
There are many similar tasks in mobile and wired line environment, and we would
like to achieve compatible, inter-working solutions. So it is a plausible idea
to use the protocols of the wired line network in mobile environment too.
However, the mobile and wired line environment differ significantly; mainly the
bandwidth is different in the two networks. Although the difference is going to
be smaller with help of new generation of mobile networks, it will still remain
significant. An acceptable solution is to compress these protocols. This
article presents our research and results about Session Initiation Protocol
(SIP) compression.
First we describe an implementation of SigComp layer, a solution for
compressing messages generated by application protocols such as SIP. We have
created a demonstration system, which connects two SIP user agents to each
other and ensures the compression and decompression of the messages between
them. After that we show our development about adapting various compressing
algorithms for SIP compression, and we evaluate them.