VoIP Introduction
- Originally separate infrastructure
- VoIP is overlay on top of data services
- A wire that basically handles both things
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- Audio is digitized by a codec
- Analog to digital conversions
- Something your sound card does
- Traffic classification
- If you see real time audio you can enable policies to speed it out or slow it down for example
- Traffic marking
- When we set things like the Type of Service (ToS) or the Class of Service (CoS)
- To set priorities between services
- Traffic prioritization
- We use it to leverage queuing, have some packets go before these other packets
- Which data gets served first.
VoIP Components
- When we want to take the VoIP traffic we may encounter with the Voice Router
- Routers are smart enough to monitor for quality over the internet
- It's too hard to deliver a consistent audio stream
- Call Center
- Voice gateway
- May be able to handle PSTN stuff
- ISDN interface
- Deadends on device
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VoIP Considerations
- Service Level Agreement
- Application will perform at a given level
- Is a promise.
- Cost of downtown
- Maybe it is important to have backup solutions
- Location services
- 911
- We need our 911 services in place
- If 911 services are not functioning you can fall in a law suit
- Network Performance
- Quality of Service (QoS)
- Maintain a particular level of quality for our service.
- Traffic Policing
- You can specify how fast certain applications perform on the network
- Figure out who are my top talkers then you can create policies to balance traffic