VOIP Advanced Setting

Configure the following VOIP-related parameters. And press SAVE SETTINGS button.

Support Call Waiting
Caller-ID Presentation
Support User-Agent Header
Support Out of Band DTMF
Use SRV option for SIP registration
Use SIP ALG option
Call Hold Version
Telephony Hook Flash Timer ms ~ ms
Telephony Tone Country Setting
Advanced Call Feature
Do Not Disturb Enable
Call forwarding number
Forward unconditionally
Forward on "busy"
Forward on "no answer"
Voice Codec Configuration
Available Codecs   Selected Codecs