VOIP CHALLENGES

1. Delay/Network latency

1.1. Packets arrive late

1.2. fixed delays

2. Jitter

2.1. Queuing,Contention and serialization

2.2. Slow and heavy congested links

3. Echo

3.1. Annoying repitition of voice

3.2. Types

3.2.1. Talkers echo

3.2.2. LIsteners echo

3.3. Echo cancellers-to remove echoes

4. Systen capacity/Available bandwidth

4.1. Sufficient bandwidth

4.2. Limited resource

4.3. Symmetric bandwidth

5. Packet loss

5.1. Packets drooped,when network is congested

5.2. 40 to 80 ms of speech info

5.3. Packet Loss Concealment/Packet loss Recovery

6. Security

6.1. esy to eavesdropping

6.2. Compression used to prevent eavesdrop

6.3. Encryption and cryptography are best solns.