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FEATURE 1
Technology that Supports IP Phones
Thorough Examination of SIP
- The role of SIP (Session Initiation Protocol) is to
allow computers to communicate with each other directly via the Internet
using various applications. Many people tend to think that SIP is used
only for IP phones, but its application is not limited to IP phones.
SIP is a general-purpose protocol that can perform a wider variety
of tasks.
This article examines the capabilities of SIP from various
points of view.
Basics: Inviting communication partners by letting them know your own
situation
Services: Its services are seemingly complex, but they are just a combination
of basic procedures
Q&A
Boxed Articles
- Operating a Windows-based SIP server
- Installing freeware SIP softphone
- Using capture software to analyze SIP packets on a network
FEATURE 2
How Can the Type of Data Be Identified?
Tasks of “MIME”
- E-mail and Web-browsing software converts received data into a suitable
form and promptly displays it on the screen. In the past, only texts
written in English could be sent via e-mail, but now it is possible
not only to exchange e-mails in Japanese but also to attach files to
e-mails and write HTML-based email messages.
These useful features
are possible thanks to “MIME” (Multipurpose Internet Mail
Extension), a standard for describing different types of data.
This
article examines the performance of MIME, which is playing an important
role behind the scenes.
Prologue: It was necessary to expand the functions of e-mail software
that could only be used to exchange messages in English
Basics: There are three technological elements: notification, division,
and encoding
Applications: Applications such as web access software use its specifications,
and Media Type is widely used
Q&A: Deepen your understanding by studying the answers to simple
questions
Question 1: How is the media type of an attached file decided?
Question 2: Why can a file whose name is turned into garbled characters
find its destination?
Question 3: Is there any other way to use the multipart media type,
in addition to its application to attached files?
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