Draytek Vigor 2130 Series, User Manual, Page: 126 / 353

Vigor2130 Series User’s Guide 116
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 Detection 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 invoke this
function; click off to close the function.