VOIP. (Voice Over IP) Yonca Cumurcu Koray Kurt. Today, we will deal with;. What is VoIP? Ways of using VoIP? What is PSTN? Which protocols are used? What are the Challanges? Advantages of the VoIP usage? Which companies produce VoIP software?
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(Voice Over IP)
• VoIP allows you to make telephone calls
using a computer network, over a data network like the Internet
• For ourpurposes we will restrict it tomean voice communications among 2 or more computers.
Need a gateway that connects IP network to phone network
AT-RG613TX Gateway, 3 x 10/100TX LAN, 2 x FXS, 1 x 100TX WAN port
Identifies the higher layer process which originated the data.
Destination port :
Identifies with higher layer process to which data is being
The length in octets of the UDP data and payload (minimum 8).
Optional field supporting error detection.
eg: audio / video conferencing, server-based orp2p
SIP works as follows;
The format of the Request packet
- Invite: Initiate Call
- Ack: Confirm Final Response
-Bye: Terminate and Transfer Call
- Cancel: Cancel Searches and ‘Ringing’
-Options: Features Support by Other Side
- Register:Register with Location Service
The format of the Response message
– Call signaling H.225
– Media control H.245
– Audio coding G.711, G.722, G.723, G.728, G.729 (G.711 is most used, G.729 is most quality enhanced)
– Video coding H.261, H263
– Data sharing T.120
– Media transport RTP, RTCP
Most popular producers in Turkey are
Producers get approximately $ 2-3 membership fee monthly .
Q3: What do you think about the differences in price between PSDN and VoIP?