Grandstream Networks HT814 Administration Manual page 35

server transactions. For example, the HT812/HT814 will attempt to send a request to a
SIP server. The time it takes between sending out the request to the point of getting a
response is the SIP T1 timer. If no response is received the timeout is increased to (2*T1)
and then (4*T1). Request re-transmit retries would continue until a maximum amount of
time defined by T2. Default is 0.5 seconds.
SIP T2 Interval Identifies maximum retransmission interval for non-INVITE requests and INVITE
responses. Retransmitting and doubling of T1 continues until it reaches T2 value. Default
is 4 seconds.
Configure the SIP Timer D defined in RFC3261. 0 - 64 seconds. Default 0
SIP Timer D
DTMF Payload Defines payload type for DTMF using RFC2833.
Type
Preferred DTMF Sorts DTMF methods (in-audio, via RTP (RFC2833) or via SIP INFO) by priority.
method (in order)
Disable DTMF Uses above DTMF order without negotiation. Default is No.
Negotiation
Generate When enabled the RFC2833 events are generated until key is released. Default is No.
Continuous
RFC2833 Events
Send Hook Flash Default is No. If set to yes, flash will be sent as DTMF event.
Event
Flash Digit Control Overrides the default settings for call control when both channels are in use
Enables do not disturb, call forward and other call features via the local feature codes on
Enable Call
Features the base. Otherwise, ITSP feature codes can be used.
Default is Yes.
Off Hook Auto Dial Configures a user ID or extension number that is automatically dialed when off-hook.
Only the user part of a SIP address needs to be entered. The HT812/HT814 will
automatically append the "@" and the host portion of the corresponding SIP address.
Off Hook Auto Dial Specifies the auto-dial delay after off hook.
Delay
Proxy-Require Determines a SIP Extension to notify the SIP server that the HT812/HT814 is behind a
NAT/Firewall.
Use NAT IP Defines NAT IP address used in SIP/SDP messages. It should only be used if required
by ITSP.
HT812/HT814 Administration Guide
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