For example, SIP can be used to carry the content for a text message (using
the MESSAGE method). The absence of an SDP does not mean that there is no session
content.
Chapter 4
Addressing in the IMS
The telephone number is dead. This may sound strange when we still dial these numbers
every day, but look at your business card. While there are still several telephone
numbers on your business card, they are followed by your e-mail address, as well as the
URL of your company??™s Web site. Wouldn??™t life be easier with just one identity?
The issue is our networks don??™t support all forms of communications. There is the
telephone network that requires telephone numbers to route calls. There is the Internet
that requires e-mail addresses to route mail. The Web requires Universal Resource
Locators (URLs) to identify Web sites.
If there could be one network, supporting all connections, there would only be one
identity needed for all communications. We are now getting closer to being able to realize
this. The IMS model allows operators to use one account to support everything that
a subscriber needs to communicate.
Not too long ago an e-mail address was unusual to find on business cards. Not everyone
had one. Today, most people I know have several addresses. They use one (or
more) for personal use, they have one for business use, and of course there is the family
e-mail address.
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