Grandstream Networks 286

HandyTone -286 User Manual Grandstream Networks, Inc.

G723 Rate: This defines the encoding rate for G723 vocoder. By default, 6.3kbps rate is

chosen.

iLBC frame size This defines the size of the iLBC codec frame. The default setting is 20ms.

iLBC payload type This defines the iLBC payload type. The default setting is 97. The valid range

is between 96 and 127.

Silence Suppression This con trols 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

phone 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.

Fax Mode T.38 (Auto Detect) FoIP by default, or Pass-Through (must use codec

PCMU/PCMA)

Layer 3 QoS This field defines the layer 3 QoS parameter which can be the value used for IP

Precedence or Diff-Serv. Default value is 48

Layer 2 QoS This setting includes two fields. The 802.1Q/VLAN Tag contains the value

used for layer 2 VLAN tag. Default setting is blank. And 802.1p priority value

contains the value of the priority value.

Allow incomin

SIP

messages from SIP

proxy only

If set to “Yes”, the device will ignore any SIP message that does not come from

the IP address (Source IP in the IP header) that it is registered to. Default is

No.

Use DNS SRV This parameter controls whether the IP phone supports the DNS SRV route

function.