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

Conference URI  

Allows users to manually configure the conference URL. The default is null.  

Use First  

Includes only the first matching vocoder in its 200OK response, otherwise it will include all matching vocoders in  

Matching  

Vocoder in  

200OK SDP  

same order received in INVITE.  

Default is No.  

Preferred  

Vocoder  

Configures vocoders in a preference list (up to 8 preferred vocoders) that will be included with same order in SDP  

message. Vocoder types are G.711 A-/U-law, G.726-32, G.723, G.729, iLBC and OPUS  

Voice Frames  

per TX  

Transmits a specific number of voice frames per packet. Default is 2; increases to 10/20/32/64 for  

G711/G726/G723/other codecs respectively.  

Operates at specified encoding rate for G.723 vocoder. Available encoding rates are 6.3kbps or 5.3kbps.  

Default is 6.3kbps.  

G723 Rate  

iLBC Frame  

Size  

Specifies iLBC packet frame size (20ms or 30ms). Default is 20ms.  

Disables OPUS stereo in SDP. Default is No.  

Disable OPUS  

Stereo in SDP  

Determines payload type for iLBC. Valid range is between 96 and 127.  

Default is 97.  

iLBC Payload  

Type  

OPUS Payload  

Type  

Determines payload type for OPUS. Valid range is between 96 and 127. Default is 123.  

Allows detecting the absence of audio and conserves bandwidth by preventing the transmission of “silent packets”  

over the network.  

Default is No.  

VAD  

Changes the destination to send RTP packets to the source IP address and port of the inbound RTP packet last received  

by the device. Default is No.  

Symmetric RTP  

Fax Mode  

Specifies the fax mode: T.38 (Auto Detect) FoIP by default, or Pass-Through. If using Pass-through mode, select  

preference codec as PCMU or PCMA.  

Re-Invite after  

Fax Tone  

Permits the unit to send out the re-INVITE for T.38 or Fax Pass Through if a fax tone is detected. Default is Enabled  

Selects jitter buffer type (Fixed or Adaptive) based on network conditions.  

Detected  

Jitter Buffer  

Type  

High (initial 200ms, min 40ms, max 600ms) Note: not all vocoders can meet the high requirement.  

Medium (initial 100ms, min 20ms, max 200ms).  

Jitter Buffer  

Length  

Low (initial 50ms, min 10ms, max 100ms).  

Selects SRTP mode to use (“Disabled”, “Enabled but not forced”, or “Enabled and forced”). Default is Disabled  

It uses SDP Security Description to exchange key. Please refer to  

SDES: https://tools.ietf.org/html/rfc4568  

SRTP Mode  

SRTP: https://www.ietf.org/rfc/rfc3711.txt  

Allows users to select supported SRTP Key Length. the available values are :  

1. AES 128&256 bit  

2. AES 128 bit  

SRTP Key  

Length  

3. AES 256 bit  

Set to AES 128&256 bit By Default.  

Crypto Life  

Time  

Adds crypto life time header to SRTP packets. Default is Yes.  

Depends on standard phone type (and location).  

SLIC Setting  

Caller ID  

Scheme  

Selects the caller id scheme, for example: Bellcore/Telcordia, ETSI-FSK …  

Defines the start and stop tones (Default, A, B, C, D or #) to delimit CID.  

DTMF Caller ID  

Disable analog phone’s caller ID when receiving a call with “Anonymous”, “unavailable” or “unknown” in FROM  

Disable  

header and without “Display info”.  

Unknown Caller  

ID  

Note: This relies also on analog phone’s design, some phones will still display “unknown” with this feature enabled.  

Default is No.  

Replace  

Beginning ‘+’  

with 00 in Caller  

ID  

When this feature is set to Yes, device will replace the “+” sign at the beginning of a number in the FROM header.  

Default is No.  

Reverses the polarity upon call establishment and termination.  

Default is No.  

Polarity  

Reversal  

Loop Current  

Disconnect  

Allows the traditional PBX used with HT81x to apply this method for signaling call termination. Method initiates  

short voltage drop on the line when remote (VoIP) side disconnects an active call. Default is No.  

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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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