With the help of IP networks new tools have emerged, such as Voice over IP (VoIP) and Internet Protocol Television (IPTV). Nowadays, we can see various websites streaming audio and video services concurrently. This is possible with the help of IP networks to transmit information throughout the globe. Streaming of audio/video may be done live or it can be stored. In some cases, real time audio/video application is used.

1. UNIT NAME: ADVANCED TOPICS IN NETWORKING
PROJECT TITLE: IP NETWORKS AND MULTIMEDIA
SERVICES

2. WHAT ARE INTERNET PROTOCOL (IP) BASED
NETWORKS?
• IP networks serve as a communication medium that uses Internet Protocol to
transmit and receive messages
• These networks consist of hosts; and the transmission of data packets is
addressed by an IP address
• IP networks require that all the connected devices, mainly servers, routers and
switches must be configured within the TCP/IP suite containing valid IP address
to undergo any network communication

3. WHY IP NETWORKS?
• They are cheaper
• They provide more flexibility in the use of bandwidth
• They are much secure
• Help us to communicate through different multimedia devices concurrently

4. WHAT ARE MULTIMEDIA SERVICES?
• Multimedia can be termed as a combined form of medias such as, texts, images,
audios and videos.
• Services based on multimedia are called as Multimedia Services.
• These services are used to input, input and store the data.
• However, with the increasing demand, these services needed to become much
faster and cheaper, which will be discussed in the next slide.

5. HOW ARE IP NETWORKS LINKED TO MULTIMEDIA
SERVICES?
• With the help of IP networks new tools have emerged, such as Voice over IP
(VoIP) and Internet Protocol Television (IPTV).
• Nowadays, we can see various websites streaming audio and video services
concurrently.
• This is possible with the help of IP networks to transmit information throughout
the globe.
• Streaming of audio/video may be done live or it can be stored. In some cases,
real time audio/video application is used.

6. STORED STREAMING OF MULTIMEDIA SERVICES
• This involves processing of on-demand requests for compressed audio/video
files.
• The playing of audio and video can be controlled
• Media player uses URL in metafile to access the media server to download the
file.
• Stored streaming is unicast.

7. STREAMING LIVE AUDIO/VIDEO STREAMING
• Broadcasting of live audio and video is done through channels such as radio
stations and television stations.
• Retransmission of data is not allowed
• They are delay sensitive
• It is multicast streaming

8. INTERACTIVE STREAMING OF AUDIO/VIDEO
• Time stamps and time relationships are considered.
• Delay hampers the communication.
• When data packets are sent to the receiver, time gets added to it by the receiver.
• The sent packets are stored in a buffer and played back.
• Threshold time is set and the remaining packets are stored in the buffer.

9. HOW VOICE OVER INTERNET PROTOCOL (VOIP)
WORKS?
• Audio is converted into digital form and sent across IP networks in the the form
of packets.
• Session Initiation Protocol (SIP) is used using three way handshake.
• Invite and acknowledge (ACK) messages are used to establish a session.
• Session can be aborted using BYE message

10. HOW IPTV WORKS?
• Switched networks are used
• Quality of service and reliability are main issues.
• Video-on-Demand service is provided.
• Content is either streamed unicast or multicast.

12. APPLICATIONS OF VOIP AND IPTV
• Video conferencing applications such as Skype, Imo, Wechat.
• Video and audio streaming websites such as YouTube, Facebook.

13. IP MULTIMEDIA SUBSYSTEM (IMS)
• An architecture for real time multimedia (voice, data, video and messaging )
services using a common IP network . It defines layered architecture.
• IMS is multi service network that provide data, video, voice service to end user
regardless of under lying access network.
• It majorly relies on Session Control Protocol (SIP).
• 3GPP (GSM community) developed it initially.

14. QOS CHALLENGES
• Multi media applications are advancing on gradual uprising scale in present day.
• This requires more bandwidth to fulfill the need.
• More bandwidth does not mean that multimedia application become better.
• Moreover it requires by providing strong policing , traffic reshaping and queuing
methods that provides uninterrupted service.

17. CONCLUSION
• IP networks has made multimedia services cost efficient
• They are user friendly
• Quality of service may be challenging to the development process

18. REFERENCES
• Kandel, D., IP Networks and Multimedia Services.
• Adamczyk, M., Denny, M., Gao, X., Huslak, N., Modaressi, A., Nguyen, H.,
Patterson, G., Pickett, M. and Stillman, S., AT&T Delaware Intellectual Property Inc,
2007. Application services infrastructure for next generation networks including
one or more IP multimedia subsystem elements and methods of providing the
same. U.S. Patent Application 11/400,891.