Grandstream Networks HT812 Series Administration Manual page 22

Maximum
Number of SIP This feature allows user to configure the number of SIP retries before failover occurs. (between 1 and 10, default is 2).
Request Retries
Defines T1 timeout value. It is an estimate of the round-trip time between the client and server transactions. For
example, the HT81x will attempt to send a request to a SIP server. The time it takes between sending out the request
SIP T1 Timeout 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.
Identifies maximum retransmission interval for non-INVITE requests and INVITE responses. Retransmitting and
SIP T2 Interval
doubling of T1 continues until it reaches T2 value. Default is 4 seconds.
SIP Timer D Configures SIP Timer D defined in RFC3261. 0 – 64 seconds. Default is 0.
DTMF Payload
Defines payload type for DTMF using RFC2833.
Type
Preferred DTMF
method (in Sorts DTMF methods (in-audio, via RTP (RFC2833) or via SIP INFO) by priority.
order)
allows users to config the Inband DTMF Duration and inter-duration.
Inband DTMF
The default Duration is 100 ms. Valid range: 40-2000 ms.
Duration
The default Inter-duration is 50 ms. Valid range: 40-2000 ms.
Allows users to configure the Inband DTMF Tx Gain.
Inband DTMF
The Valid rand is -12 to 12 db.
Tx Gain
The Default value is 0db.
DSP DTMF
Allows users to config the DSP DTMF Detector Duration Threshold
Detector
The default Duration is 30 ms. Valid range: 20-2000 ms.
Duration
The default Inter-duration is 30 ms. Valid range: 20-2000 ms.
Threshold
Disable DTMF
Uses above DTMF order without negotiation. Default is No.
Negotiation
Generate
When enabled the RFC2833 events are generated until key is released.
Continuous
Default is No.
RFC2833 Events
Send Hook Flash
Default is No. If set to yes, flash will be sent as DTMF event.
Event
When it set to YES it allows the user to perform some call setting when both channels are used while pressing:
"Flash + 1" in order to hang up the current call and resume a call that was held.
"Flash + 2" in order to hold the current call and resume a call that was held.
Flash Digit
"Flash + 3" in order to perform 3-way conference.
Control
"Flash + 4" in order to perform attended transfer.
Note: Please refer to the user guide for detailed steps to perform above operations.More additional Digit events were
added on the new firmware 1.0.43.10.
Enable Call
Waiting alert-
info In 180 When set to Yes, Alert-Info header will be added in 180 Ringing for Call Waiting case
Ringing
Response
Callee Flash to When this feature is set to Yes, device would be able to set up the 3-way conference call even when device is the
3WC callee in the second call. Default is No.
Off Hook Auto
Specifies the auto-dial delay after off hook.
Dial Delay
Proxy-Require Determines a SIP Extension to notify the SIP server that the HT81x 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.
This feature allows users to configure SIP User Agent. If not configured, device will use the default User Agent
SIP User-Agent
header.
SIP User-Agent
Configures the SIP User-Agent Postfix
Postfix
This feature allows users to configure "User-Agent" in the SIP header field, when this feature is set to"No", "User-
Add MAC in Agent" does not carry a MAC, when this feature is set "Yes except REGISTER", "User-Agent" in REGISTERSIP
User-Agent header field does not carry MAC but other SIP packet header fields carries MAC, when this
feature is set to "Yes to all SIP", "User-Agent" in the SIP packet header field will carries the MAC.
This feature allows users to configure MAC Header in the SIP packet header field, when this feature is set to "No"
Use MAC ,the MAC header field is not carried in the SIP packet header field, when this feature is set to "REGISTER Only", the
Header register packet header field carries the MAC header field but the remaining SIP packets do not carry MAC header
fields, when this feature is set to "Yes to all SIP", the MAC header field is carried in the SIP data packet header field.
Toggles between RFC2543 hold and RFC3261 hold. RFC2543 hold allows to disable the hold music sent to the other
RFC2543 Hold side, in this case IP address (0.0.0.0) it will be sent in SDP instead of the IP address of the unit . RFC3261 (a line) will
play the hold music to the other side.