Voice over IP (VoIP) Hani Al Ruwaili Abdulkrem Al Zhrani Prepared for Dr. Samir Ghadhban

What is VoIP ? It is the technology that allows us to have phone service over the Internet.

VoIP Protocol & OSI Layers

Application Layer Soft Phone ( Skype,Net2phon ) Soft Phone ( Skype,Net2phon ) Audio card Audio card Firewall OFF Firewall OFF

Presentation Layer Codecs Codecs PSTN – PCM (Pulse Code Modulation)PSTN – PCM (Pulse Code Modulation) VoIP compressionVoIP compression Free Codecs (speex,GSM)Free Codecs (speex,GSM)

Session Layer Session Initiation Protocol (SIP) Authentication Communication type Take care of IP addresses and ports numbers while transmitting data

Transport Layer Real Time Protocol Real Time Protocol Monitors the quality of the data distribution and provides control information RTP header compression saves bandwidth by compressing packet headers Provides a separate flow from RTP for UDP transport use

VoIP Hardware Soft Phone Soft Phone VoIP telephones 100~300 $ VoIP telephones 100~300 $ BandwidthBandwidth Friendly Interface (WAP)Friendly Interface (WAP) Audio PortAudio Port PSTN interface cards PSTN interface cards Analogue Telephone Adaptors (ATA) Analogue Telephone Adaptors (ATA)

PSTN interface cards

Analogue Telephone Adaptors (ATA)

Quality of Service Latency (Delay) Latency (Delay) High PriorityHigh Priority Jitter Jitter Jitter BufferJitter Buffer

Conclusion For people who adopting communications with, VoIP can save on infrastructure costs For people who adopting communications with, VoIP can save on infrastructure costs

THANK YOU Questions any one ?