Nortel 1000 Description, Installation And Operation Manual page 328

Page 328 of 644
553-3001-363 Standard 2.00
Install and configure IP Trunk 3.01 (and later) node
7 To turn off a codec, click the codec and uncheck the checkbox.
8 To change the preferred order of codec selection, for outgoing calls, if
required, select the codec and click the Move Up and Move Down
buttons. The IP Trunk 3.01 (and later) node requests the codec at the top
of the list first on outgoing calls.
9 To enable Voice Activity Detection (VAD) for Silence Suppression, check
the appropriate box. To disable VAD for Silence Suppression, uncheck
the box.
Change default DiffServ/ToS value for Control and Voice
Follow the steps in Procedure 21 to change the default DiffServ/ToS value for
Control and Voice.
Procedure 21
Changing the default DiffServ Codepoint (DSCP) value for Control and
Voice
1 Enter the DSCP value for Control packets and Voice packets, if
required, to obtain better QoS over the IP data network (LAN/WAN). Do
not change from default value of 0 unless instructed by IP network
administrator.
The DSCP determines the priority of the control and voice packets in the
network router queues. The values entered in these two boxes must be
coordinated across the entire IP data network. Do not change them
arbitrarily.
DSCP values must first be converted to a decimal value of the
DiffServ/TOS byte in the IP packet header. For example, the 8-bit TOS
field value of 0010 0100 which indicates "Precedence = Priority";
"Reliability = High" is converted to a decimal value of 36 before being
entered in the Control or Voice fields.
2 Click Apply.
September 2004
End of Procedure
End of Procedure