GRANDSTREAM HT812 Analog FXS IP Gateway 2 Port + NAT Router User Guide

Maximum  

Number of SIP  

Request Retries  

This feature allows user to configure the number of SIP retries before failover occurs. (between 1 and 10, default is 2).  

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  

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 T1 Timeout  

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.  

SIP T2 Interval  

SIP Timer D  

Configures SIP Timer D defined in RFC3261. 0 – 64 seconds. Default is 0.  

Defines payload type for DTMF using RFC2833.  

DTMF Payload  

Type  

Preferred DTMF  

method (in  

order)  

Sorts DTMF methods (in-audio, via RTP (RFC2833) or via SIP INFO) by priority.  

allows users to config the Inband DTMF Duration and inter-duration.  

The default Duration is 100 ms. Valid range: 40-2000 ms.  

The default Inter-duration is 50 ms. Valid range: 40-2000 ms.  

Inband DTMF  

Duration  

Allows users to configure the Inband DTMF Tx Gain.  

The Valid rand is -12 to 12 db.  

Inband DTMF  

Tx Gain  

The Default value is 0db.  

DSP DTMF  

Detector  

Allows users to config the DSP DTMF Detector Duration Threshold  

The default Duration is 30 ms. Valid range: 20-2000 ms.  

Duration  

Threshold  

The default Inter-duration is 30 ms. Valid range: 20-2000 ms.  

Disable DTMF  

Negotiation  

Uses above DTMF order without negotiation. Default is No.  

Generate  

When enabled the RFC2833 events are generated until key is released.  

Default is No.  

Continuous  

RFC2833 Events  

Send Hook Flash  

Event  

Default is No. If set to yes, flash will be sent as DTMF 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 + 3” in order to perform 3-way conference.  

Flash Digit  

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  

Ringing  

When set to Yes, Alert-Info header will be added in 180 Ringing for Call Waiting case  

Response  

Callee Flash to  

3WC  

When this feature is set to Yes, device would be able to set up the 3-way conference call even when device is the  

callee in the second call. Default is No.  

Off Hook Auto  

Dial Delay  

Specifies the auto-dial delay after off hook.  

Proxy-Require  

Use NAT IP  

Determines a SIP Extension to notify the SIP server that the HT81x is behind a NAT/Firewall.  

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  

header.  

SIP User-Agent  

SIP User-Agent  

Postfix  

Configures the SIP User-Agent Postfix  

This feature allows users to configure "User-Agent" in the SIP header field, when this feature is set to“No”, "User-  

Agent" does not carry a MAC, when this feature is set “Yes except REGISTER”, "User-Agent" in REGISTERSIP  

header field does not carry MAC but other SIP packet header fields carries MAC, when this  

Add MAC in  

User-Agent  

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”  

,the MAC header field is not carried in the SIP packet header field, when this feature is set to “REGISTER Only”, the  

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.  

Use MAC  

Header  

Toggles between RFC2543 hold and RFC3261 hold. RFC2543 hold allows to disable the hold music sent to the other  

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.  

RFC2543 Hold  

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General	Details
Name	GRANDSTREAM HT812 Analog FXS IP Gateway 2 Port + NAT Router User Guide
Make	GRANDSTREAM
Language	English
Filetype	PDF (Download)
File size	MB

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