Grandstream Networks, Inc. |
Preferred Vocoder | The HandyTone ATA supports up to 6 different vocoder types including G.711 |
| law，G.723.1, G.726, G.728, G.729A/B, iLBC. Depending on the product model, |
| some of these vocoders may not be provided in standard release. |
| A user can configure vocoders in a preference list that will be included with the same |
| preference order in SDP message. The first vocoder in this list can be entered by |
| choosing the appropriate option in “Choice 1”. Similarly, the last vocoder in this list can |
| be entered by choosing the appropriate option in “Choice 6”. |
G723 Rate: | This defines the encoding rate for G723 vocoder. By default, 6.3kbps rate is chosen. |
iLBC frame size: | This sets the iLBC size in 20ms or 30ms |
iLBC payload type: | This defines payload time for iLBC. Default value is 98. The valid range is between 96 |
| and 127. |
Silence Suppression | This controls the silence suppression/VAD feature of G723 and G729. If set to “Yes”, |
| when a silence is detected, small quantity of VAD packets (instead of audio packets) |
| will be sent during the period of no talking. If set to “No”, this feature is disabled. |
Voice Frames per TX | 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. |
Layer 3 QoS | This field defines the layer 3 QoS parameter which can be the value used for IP |
| Precedence or |
Layer 2 QoS | This contains the value used for layer 2 VLAN tag. Default setting is |
| blank. |
Use DNS SRV: | Default is No. If set to Yes the client will use DNS SRV to lookup for the server |
User ID is Phone | If the HandyTone ATA has an assigned PSTN telephone number, |
Number | then this field will be set to “Yes”. Otherwise, set it to “No”. If |
| “Yes” is set, a “user=phone” parameter will be attached to the |
| “From” header in SIP request |
SIP Registration | This parameter controls whether the HandyTone ATA needs to send REGISTER |
| messages to the proxy server. The default setting is “Yes”. |
Unregister on Reboot 
Default is No. If set to yes, the SIP user will be unregistered on reboot.
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