Chapter 3 Phone Use and Configuration
Note: Enter any advanced SIP configuration information as it was given to you by your SIP service provider. If you do not have any advanced configuration information, you can skip this section.
Figure 5 Advanced SIP Settings (part 1)
The following table describes the labels in this screen.
Table 2 SIP Setting
LABEL | DESCRIPTION |
SIP Port | Enter the port number on your ZyXEL Device that SIP calls made with |
| the selected phone should use. |
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|
Media Port | Enter the port number on your ZyXEL Device that RTP media packets |
| should use. |
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|
Packetization | Select the voice codec packetization interval in milliseconds. The default |
| is 20 ms. This is used to minimize loss that happens during |
| transmission of voice data over the network. |
| The packetization interval effectivately sets the size of each voice |
| sample contained within a data packet. At 20 ms, the codec employed |
| in digitizing the voice signal can usually compensate for data |
| degredation and attenuation by using Packet Loss Concealment (PLC). |
| However, if the loss becomes too great, noticeable distortion occurs. |
| Setting the packetization interval higher, however, may introduce more |
| problems depending on the codec (such as G.711). Other codecs (such |
| as G.729 and G.723) have improved PLC techniques and as such can |
| also withstand a higher packetization interval; this means more packets |
| can be lost in transit without a noticeable loss in quality. |
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