Grandstream Networks HT813 Administration Manual page 39

Depends on standard phone type (and location). Available options:
USA 1 (BELLCORE 600 ohms)
USA 2 (BELLCORE 600 ohms + 2.16uF)
AUSTRALIA
CHINA CO
CHINA PBX
SLIC
EUROPEAN CTR21
Setting
GERMANY
INDIA/NEW ZEALAND
JAPAN CO
JAPAN PBX
STANDARD 900 ohms
UK
Selects the caller ID scheme. Available options:
Bellcore/Telcordia
ETSI-FSK during ringing
ETSI-FSK prior to ringing with DTAS
ETSI-FSK prior to ringing with LR+DTAS
ETSI-FSK prior to ringing with RP
ETSI-DTMF during ringing
ETSI-DTMF prior to ringing with DTAS
Caller ID
ETSI-DTMF prior to ringing with LR+DTAS
Scheme
ETSI-DTMF prior to ringing with RP
SIN 227 – BT
NTT JAPAN
DTMF Denmark prior to ringing with no DTAS no LR
DTMF Denmark prior to ringing with LR
DTMF Sweden/Finland prior to ringing with LR
DTMF Brazil
DTMF-FSK Brazil
Defines the start and stop tones as delimiters for the caller ID.
DTMF
Caller ID
Start Tone and Stop Tone can be set to "Default", "A", "B", "C", "D" or "#"
Polarity
Reverses the polarity upon call establishment and termination. Default is No.
Reversal
Loop
Allows the traditional PBX used with HT813 to apply this method for signaling call termination. Method
Current
initiates short voltage drop on the line when remote (VoIP) side disconnects an active call. Default is No.
Disconnect