Grandstream Networks HT818 Administration Manual page 29

Header Uses
Selects the Caller ID display order which need to be respected by the ATA.
The available options are:
Caller ID Fetch Auto: When set to "Auto", the ATA will look for the caller ID in the order of P-Asserted Identity Header, Remote-
Order Party-ID Header and From Header in the incoming SIP INVITE.
Disabled: When set to "Disabled", all incoming calls are displayed with "Unavailable".
From Header: When set to "From Header", the ATA will use the FROM header to display the caller ID.
Allows to reset the devices directly through SIP Notify. If "Allow SIP Factory Reset" is set to "YES" under FXS PORT,
then the ATA receives the NOTIFY from the SIP server with Event: reset, the HT should perform a factory reset after
the authentication.
Allow SIP
Factory Reset The authentication in this case can be either with:
The admin password if no SIP account is configured on the HT.
With the credentials of the SIP account if configured on the ATA.
Maximum
Number of SIP This feature allows user to configure the number of SIP retries before failover occurs. (between 1 and 10, default is
Request 2).
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
to the point of getting a response is the SIP T1 timer. If no response is received the timeout is increased to (2*T1)
Timeout
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 Sorts DTMF methods (in-audio, via RTP (RFC2833) or via SIP INFO) by priority.
(in 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.
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
RFC2833
Default is No.
Events
Send Hook
Default is No. If set to yes, flash will be sent as DTMF event.
Flash Event