Chapter 9 The VoIP General Screens

Table 66 Media (continued)

LABEL

DESCRIPTION

Packet Loss

Packets may be dropped due to an overwhelming amount of traffic on the

Concealment

network. Some degree of packet loss will not be noticeable to the end user, but

 

as packet loss increases the quality of sound degrades. Select this to have the

 

WiMAX Device to improve the voice quality when packet loss occurs.

 

 

T.38 Static Jitter

T.38 is an ITU-T standard that VoIP devices use to send fax messages over the

Length

Internet.

 

Select the number of milliseconds for the jitter buffer size used for transmitting

 

T.38 fax messages.

 

 

9.3 QoS

This section describes the features of the Quality of Service (QoS) screen.

Click VoIP > General > QoS to set up Type of Service (ToS) and Differentiated Services (Diffserv) settings for voice traffic transmission through the WiMAX Device.

Figure 85 QoS

The following table describes the labels in this screen.

Table 67 QoS

LABEL

DESCRIPTION

SIP ToS/DiffServ

Enter the DSCP value you want to mark on all outgoing SIP packets generated by

 

the WiMAX Device for DiffServ-enabled networks. Since DiffServ uses the first 6

 

bits of the 8-bit IP ToS field to represent the DSCP value, enter here the 6-bit

 

DSCP value you want to mark in hexadecimal (in a format of 0x00), and the

 

WiMAX Device will then automatically append 2 bits '0' to make a whole 8-bit

 

ToS field value for all outgoing SIP packets.

 

For example, if you enter 0x2E, it is 101110 in binary for DSCP. The WiMAX

 

Device converts it to 10111000 in binary and marks on the IP ToS field of all the

 

outgoing SIP packets.

 

 

RTP ToS/DiffServ

Enter the DSCP value you want to mark on all outgoing VoIP data packets

 

(including both RTP and T.38 UDPTL packets) generated by the WiMAX Device for

 

DiffServ-enabled networks.

 

 

154

 

WiMAX Device Configuration User’s Guide