Grandstream Networks HT-488 User Manual page 23

DTMF Payload Type
Send DTMF
Send Flash Event
Enable Call Features
Use Bell-style
3-way Conference
Offhook
Auto-Dial
Proxy-Require
Disable Call Waiting
NAT Traversal (STUN)
No Key Entry Timeout
Preferred Vocoder
Voice Frames per TX
G723 Rate:
Grandstream Networks, Inc.
This is usually necessary when multiple HandyTone ATAs are behind the same NAT.
This parameter sets the payload type for DTMF using RFC2833
This parameter specify the mechanism to transmit DTMF digit. There are 3 modes
supported: in audio which means DTMF is combined in audio signal (not very reliable
with low-bit-rate codec), via RTP (RFC2833), or via SIP INFO. Multiple DTMF
transmission schema can be selected.
Default is NO. If set to yes, flash will be sent as DTMF event.
Default is Yes. Advance call features and feature codes functions are supported
locally.
Default setting is No. When it is set to yes, the user will use Bell-style to initiate
conference.
This parameter allows users to configure a User ID or extension number to be
automatically dialed upon offhook. Please note that only the user part of a SIP address
needs to be entered here. The HandyTone ATA will automatically append the "@" and
the host portion of the corresponding SIP address.
Note: Please write down the IP address of the ATA if you use this feature as it
will prevent you to access the IVR and the only way to access the device
configuration is via the web configuration page.
SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
Default is No.
This setting decides whether the NAT traversal mechanism is activated. It should be
set to "Yes" if the device is behind a NAT router. If no outbound proxy is configured, a
STUN server needs to be set to activate STUN detection mechanism. Usually ITSP will
provide these settings.
If this field is set to "Yes", then the device will periodically (every Keep-alive
interval) send a dummy UDP packet to the SIP server to pinhole the NAT.
Default is 4 seconds.
The HandyTone ATA supports 6 different Vocoder types including
1. G.711 A/µ law,
2. G.723.1,
3. G.726-32,
4. G.729A,
5. iLBC
Users can configure Vocoders in a preference list that will be included with the same
preference order in SDP message.
This field contains the number of voice frames to be transmitted in a single packet.
When setting this value, the user should be aware of the requested packet time (used
in SDP message) as a result of configuring this parameter. This parameter is
associated with the first vocoder in the vocoder preference list or the actual used
payload type negotiated between the 2 conversation parties at run time.
FOR EXAMPLE:
1. If the first vocoder is configured as G723 and the "Voice Frames per TX" is set to
2, then the "ptime" value in the SDP message of an INVITE request will be 60ms
because each G723 voice frame contains 30ms of audio.
2. Similarly, if this field is set to 2 and if the first vocoder chosen is G729 or G711 or
G726, then the "ptime" value in the SDP message of an INVITE request will be
20ms.
If the configured voice frames per TX exceeds the maximum allowed value, the
HandyTone ATA will use and save the maximum allowed value for the corresponding
first vocoder choice.
The maximum value for PCM is 10(x10ms) frames; for G726, it is 20 (x10ms) frames;
for G723, it is 32 (x30ms) frames; for G729/G728, 64 (x10ms) and 64 (x2.5ms) frames
respectively.
This defines the encoding rate for G723 vocoder. Default setting is 6.3kbps.
HT488 User Manual
Firmware 1.0.3.64
Page 23 of 33
Last Updated: 4/2007