Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.

  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 16 Media Transport > 16.3 Media Transport in the IMS

16.3 Media Transport in the IMS

The IMS uses RTP over UDP to transport media unreliably. DCCP may be used in the future, but at present it is not mature or widespread enough for the IMS.

Figure 16.7: SRTP protection

c16_image007.jpg

Regarding security the IMS does not provide any kind of security at the media level. It is assumed that the traffic on the radio access is encrypted at lower layers and that the core IMS network is trustworthy. So, SRTP is not supported.

When it comes to reliable transport protocols the natural choice would be to use TCP. It has been a stable protocol for many years and is supported virtually everywhere. In addition to this there are TCP extensions specifically designed to make its flow control mechanisms more suitable for radio links (e.g., RFC 3522 [211] defines the Eifel detection algorithm).


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint