Draytek Vigor2100V User Manual page 107

Enter your SIP username (the first part of your SIP address
before the @ sign)
Account
Name
This field contains a name or a number. It is also the name for
Authorization
SIP Authorization. If this setting value is the same as Display
User
Name, please press "Duplicate".
Your SIP URL address as provided when you registered with a
SIP service.
Password
The time duration that your SIP registrar server keeps your
Expire Time
registration record. Before the time expires the Vigor will issue
another register message to registrar server again.
CODEC/RTP/DTMF Setup
Default Codec: Select one of five CODECs as the default for your VoIP calls.
The CODEC used for each call will be negotiate with the peer party before
each session, and so many 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
VoIP
11-8