ATCOM 5520 User Manual page 35

Auto Detect Server Interval: Set examining interval of the server, default
is 60 seconds.
User Agent: Set the user agent if have, the default is VoIP Phone 1.0.
Signal Key: Signal encryption Key.
Media Key: voice stream encryption Key.
Local Port: Local SIP signal port，default as 5060.
Hotline Number: Set hot line number of each line.
MWI Number: Set SIP1 voicemail Number.
Enable Keep Authentication: Enable/Disable Keep Authentication
o
System will take the last authentication field which is passed the
authentication by server to the request packet. It will decrease the
server's repeat authorization work, if it is enable.
Auto Detect Server: Enable/Disable keeps NAT of SIP alive. If some
server refuse to register with too short interval time, and has no packets
sending to device in private network to keep NAT alive, user could set this
function ON. It need set the keep alive interval time less than the NAT
server's.
Enable Via rport: Enable/Disable system to support RFC3581. Via rport is
special way to realize SIP NAT.
Enable PRACK: Enable or disable SIP PRACK function, suggest use the
default config.
Long Contact: Set more parameters in contact field.
Click to Talk: Set click to Talk (need practical software support).
Ban Anonymous Call: Set to ban Anonymous Call.
Dial Without Register: Set call out by proxy without registration.
Enable Strict Proxy: Support the special SIP server-when phone receives
the packets sent from server， phone will use the source IP address, not
the address in via field.
Enable Conference Num: conference ID.
Forward Type: Select call forward mode, the default is Off .
Off：Close down calling forward.
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