Draytek Vigor2850 Series, Руководство пользователя

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Vigor2850 Series User’s Guide
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solution, you can choose this option.
Call Forwarding
There are four options for you to choose.
Disable
is to close
call forwarding function.
Always
means all the incoming
calls will be forwarded into SIP URL without any reason.
Busy
means the incoming calls will be forwarded into SIP
URL only when the local system is busy.
No Answer
means if the incoming calls do not receive any response,
they will be forwarded to the SIP URL by the time out.
SIP URL
– Type in the SIP URL (e.g., aaa@draytel.org or
abc@iptel.org) as the site for call forwarded.
Time Out
– Set the time out for the call forwarding. The
default setting is 30 sec.
Ring Port
Set Phone 1 and/or Phone 2 as the default ring port(s) for
this SIP account.
Ring Pattern
Choose a ring tone type for the VoIP phone call.
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.