Draytek Vigor2830 Series User Manual page 299

Call Forwarding
Ring Port
Ring Pattern
Prefer Codec
None – Disable this function.
Stun – Choose this option if there is Stun server provided
for your router.
Manual – Choose this option if you want to specify an
external IP address as the NAT transversal support.
Nortel – If the soft-switch that you use supports Nortel
solution, you can choose this option.
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.
Set Phone 1 and/or Phone 2 as the default ring port(s) for
this SIP account.
Choose a ring tone type for the VoIP phone call.
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.
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Vigor2830 Series User's Guide