Grandstream Networks HT-488 User Manual page 24

Send Flash Event
Enable Call Features
Use Bell-style
3-way Conference
Offhook
Auto-Dial
Proxy-Require
Disable Call Waiting
Disable Call Waiting
Caller ID (CWCID)
NAT Traversal (STUN)
No Key Entry Timeout
Preferred Vocoder
Voice Frames per TX
G723 Rate:
iLBC frame size:
Grandstream Networks, Inc.
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. If set to YES, the feature "Call Waiting Indication" will not be
activated.
Default is No. If set to YES, user will not be able to see CWCID information. If
set to No, also requires support of this feature by analog phone connected to
FXS port.
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 G.711 A-/U-
law，G.723.1, G.726-32, G.729A, 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 above vocoder
Preference List or the actual used payload type negotiated between the 2
conversation parties at run time.
e.g., if the first vocoder is configured as G723 and the "Voice Frames per TX"
is set to be 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.
Similarly, if this field is set to be 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.
This sets the iLBC size in 20ms or 30ms
HT488 User Manual
Firmware 1.0.3.86
Page 24 of 31
Last Updated: 7/2007