Enable Call Features
Use
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:
iLBC payload type:
Silence Suppression
Fax Mode
Default is Yes. Advanced call features and feature codes functions are supported locally.
If this parameter is set to “Yes”, user will be able to make Bellcore style
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.
SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
Default is No. User can use * code to use this feature per call basis.
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 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
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.
Default is 4 seconds. While dealing, the number will considered as completed if during this timeout no additional entry has been done.
The HT496 supports up to 6 different Vocoder types including G.711
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”.
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.
Default is 6.3kbps rate. Defines the encoding rate for G723 vocoder.
Sets the iLBC frame size in 20ms or 30ms
Defines payload time for iLBC. Default value is 97. Valid range: 96 - 127.
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.
T.38 (Auto Detect) FoIP (fax over IP) by default, or
Grandstream Networks, Inc. | HT496 User Manual | Page 24 of 29 |
| Firmware 1.0.3.86 | Last Updated: 7/2007 |
