Grandstream Networks HT496 Network Card User Manual


 
Grandstream Networks, Inc. HT496 User Manual Page 24 of 29
Firmware 1.0.3.86 Last Updated: 7/2007
Enable Call Features Default is Yes. Advanced call features and feature codes functions are supported
locally.
Use Bell-style
3-way Conference
If this parameter is set to “Yes”, user will be able to make Bellcore style 3-way
conference. *23 will be disabled.
Off-hook Auto-Dial This parameter automatically configures and dials User ID or extension number upon
off-hook. Only the user part of a SIP address needs is entered here. The HT496 will
automatically append the “@” and the host portion of the corresponding SIP address.
Proxy-Require
SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
Disable Call Waiting
Default is No. User can use * code to use this feature per call basis.
Disable Call Waiting Caller
ID (CWCID)
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.
NAT Traversal (STUN)
This parameter defines whether the HT496 NAT traversal mechanism is activated or
not. If activated (by choosing “Yes”) and a STUN server is also specified, then the
HT496 performs according to the STUN client specification. Under this mode, the
embedded STUN client will detect if and what type of firewall/NAT is used. If the
detected NAT is a Full Cone, Restricted Cone, or a Port-Restricted Cone, the HT496
will use its mapped public IP address and port in all of its SIP and SDP messages.
If the NAT Traversal field is set to “Yes” with no specified STUN server, the HT496 will
periodically (every 20 seconds or so) send a blank UDP packet (with no payload data)
to the SIP server to keep the “hole” on the NAT open.
No Key Entry Timeout Default is 4 seconds. While dealing, the number will considered as completed if during
this timeout no additional entry has been done.
Preferred Vocoder
The HT496 supports up to 6 different Vocoder types including G.711 A-/U-law
G.723.1, G.726, G.729A/B, iLBC.
Users can configure Vocoders in a preference list included with the same preference
order in SDP message. The first Vocoder in this list is the appropriate option in “Choice
1”. The last Vocoder in this list is the appropriate option in “Choice 6”.
Voice Frames per TX Number of voice frames transmitted in a single packet. User should be aware of the
requested packet time (used in SDP message). This parameter is associated with the
first vocoder in the Vocoder Preference List or the actual payload type negotiated
between the 2 conversation parties at run time.
e.g. if the first vocoder is configured as G.723 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 G.723 voice frame contains 30ms of audio.
If the configured voice frames per TX exceeds the maximum allowed value, the HT496
will use and save the maximum allowed value for the corresponding first vocoder
choice. The maximum value for PCM is 10(x10ms) frames:
for G.726, it is 20 (x10ms) frames; .
for G.723, it is 32 (x30ms) frames;
for G.729/G.728, 64 (x10ms) and 64 (x2.5ms) frames respectively.
G723 Rate:
Default is 6.3kbps rate. Defines the encoding rate for G723 vocoder.
iLBC frame size:
Sets the iLBC frame size in 20ms or 30ms
iLBC payload type:
Defines payload time for iLBC. Default value is 97. Valid range: 96 - 127.
Silence Suppression This controls the silence suppression/VAD feature of G.723. If set to “Yes”, a small
quantity of VAD packets (instead of audio packets) will be sent during the a period of
silence. If set to “No”, feature is disabled.
Fax Mode T.38 (Auto Detect) FoIP (fax over IP) by default, or Pass-Through (must use codec
PCMU/PCMA)