![](/images/new-backgrounds/1309143/309143129x1.webp)
Voice over IP (VoIP) | Fundamentals |
|
|
An IP packet consists of protocol data and user data. Sending shorter
The length of the
Longer voice data packages are generally used for SIP telephony over the Internet.
The following table provides an overview of the required bandwidth for a tele- phone connection with various parameter settings. The values apply to half- duplex ethernet; for
Required bandwidth (kbit/s) with respect to Packet Length and Codec
Packet Length (ms) | G.711 (not compressed) | G.729A approx. 8 kbit/s |
|
|
|
20 | 180.8 | 68.8 |
|
|
|
30 |
| 51.2 |
|
|
|
40 |
| 42.4 |
|
|
|
50 |
| 37.12 |
|
|
|
60 |
| 33.6 |
|
|
|
70 |
| 31.09 |
|
|
|
80 |
| 29.2 |
|
|
|
7.2.3 Voice Quality
The achievable voice quality depends on various factors. It is possible to optimise
63