domain name of the servers ( These web server helps to find out the public IP of the IP phone) into “nat addr”, such as www.whatismyip.com.
nat ttl: When gateway sit behind a NAT device, it will send packets to server every “nat ttl” seconds to keep the port mapping on the NAT device alive. “nat ttl” is an integer between 10 and 65535 .default value is 20.
phone number: The local phone number or username of this phone, usually is allocated by system.
account: While calling card is set, please type the account of chosen card into this field; while md5 account item selected in local type dropdown list, enter ID here; while account is selected in local type dropdown list, enter ID here. While prefix item selected in use dialplan dropdown list, enter language indicating number, card number
and # here, such as 14589653185 
.
pin: While calling card is set, please type the password of chosen card into this field; while md5 account item selected in local type dropdown list, enter password here. While prefix item selected in use dialplan dropdown list, enter password and # here, such as 3185.
register port: The local UDP port registered with server to accept incoming handshaking messages. any number between 1024 and 65535 is acceptable.
signal port: This port is Q.931 port using TCP protocol, can be any number between 1024 and 65535.
control port: This port is H.245 port using TCP protocol, can be any number between 1024 and 65535.
dtmf: Set DTMF signal sending way by selecting control string, inband audio, signal keypad or rfc 2833 from list box.
dtmf payload : When DTMF select rfc 2833.This parameter can be used indicating type of RTP payload type. The value can be use integer
rtp port: RTP port is the port transferring and receiving voice packets using UDP protocol. This is an even number between 1024 and 65535,
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