igor2930 Series User’s Guide 
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[email protected]) as the site for call forwarded. 
Time Out
– Set the time out for the call forwarding. The 
default setting is 30 sec. 
DND (Do Not Disturb) 
mode
Set a period of peace time without disturbing by VoIP phone 
call. During the period, the one who dial in will listen busy 
tone, yet the local user will not listen any ring tone. 
Index (1-15) in Schedule - 
Enter the index of schedule 
profiles to control the DND mode according to the 
preconfigured schedules. Refer to section 
3.5.2 Schedule 
for 
detailed configuration. 
Index (1-60) in Phone Book - 
Enter the index of phone book 
profiles. Refer to section 
3.10.1 DialPlan – Phone Book 
for 
detailed configuration.
CLIR (hide caller ID)
Check this box to hide the caller ID on the display panel of the 
phone set.
Call Waiting
Check this box to invoke this function. A notice sound will 
appear to tell the user new phone call is waiting for your 
response. Click hook flash to pick up the waiting phone call. 
Call Transfer 
Check this box to invoke this function. Click hook flash to 
initiate another phone call. When the phone call connection 
succeeds, hang up the phone. The other two sides can 
communicate, then.
Prefer Codec 
Select one of five codecs as the default for your VoIP calls. 
The codec used for each call will be negotiated with the peer 
party before each session, and so may not be your default 
choice. The default codec is G.729A/B; it occupies little 
bandwidth while maintaining good voice quality. 
If your upstream speed is only 64Kbps, do not use G.711 
codec. It is better for you to have at least 256Kbps upstream if 
you would like to use G.711. 
Single Codec
– If the box is checked, only the selected Codec 
will be applied. 
Packet Size
-The amount of data contained in a single packet. 
The default value is 20 ms, which means the data packet will 
contain 20 ms voice information. 
Voice Active Detector -
This function can detect if the voice 
on both sides is active or not. If not, the router will do 
something to save the bandwidth for other using. Click On to