User manual

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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; connection with SEM
server
Enable URI Convert Convert # to %23 when send the URI.
Dial Without Register Set call out by proxy without registration;
Ban Anonymous Call Set to ban Anonymous Call;
Enable DNS SRV
Support DNS looking up with _sip.udp mode
Forward Type
Select call forward mode, the default is Off
l Off：Close down calling forward
l Busy：If the phone is busy, incoming calls will be forwarded
to the appointed phone.
l No answer： If there is no answer, incoming calls will be
forwarded to the appointed phone.
l Always：Incoming calls will be forwarded to the appoint
phone directly.
The phone will Prompt the incoming while doing forward.
Forward Phone Number Appoint your forward phone number.
Server Type Select the special type of server which is encrypted, or has some
unique requirements or call flows.
DTMF Mode
Select DTMF sending mode, there are three modes:
l DTMF_RELAY
l DTMF_RFC2833
l DTMF_SIP_INFO
Different VoIP Service providers may provide different modes.
RFC Protocol Edition
Select SIP protocol version to adapt for the SIP server which uses
the same version as you select. For example, if the server is
CISCO5300, you need to change to RFC2543, else phone may
not cancel call normally. System uses RFC3261 as default.
Transport Protocol Set transport protocols, TCP or UDP;
RFC Privacy Edition Set Anonymous call out safely; Support RFC3323and RFC3325;
Subscribe Expire Time Overtime of resending subscribe packet. Suggest using the
default config.
Enable Conference number Set to use sever conference.
MWI Number Input the number of the server's voice-mail box
Click to Talk Set click to Talk (need practical software support).
Signal Encode Enable/Disable Signal Encrypt.
RTP Encode Enable/Disable RTP Encrypt.
Enable Session Timer Set Enable/Disable Session Timer, whether support RFC4028.It