
Synway Information Engineering Co., Ltd
SMG-C Series Analog Gateway User Manual (Version 1.7.1)
Page 31
CODEC Priority
Supported CODECs and their corresponding priority for the IP end to establish a
call conversation. The table below explains the sub-items:
Sub-item Description
Priority
Priority for choosing the CODEC in an SIP conversation. The
smaller the value is, the higher the priority will be.
CODEC
Three optional CODECs are supported:
G711A
,
G711U
,
G729A/B
,
G723
, G722, AMR and
iLBC
.
Packing Time
Time interval for packing an RTP packet, calculated by ms.
Bit Rate
The number of thousand bits (excluding the packet header) that
are conveyed per second.
By default, all of the seven CODECs are supported and ordered G711A, G711U,
G729A/B, G723, G722, AMR and iLBC by priority from high to low.
The packing time and bit rate supported by different CODECs are listed in the table
below. Those values in bold face are the default values.
COEDC
Packing Time (ms)
Bit Rate (kbps)
G711A
10 /
20
/ 30 / 40 / 60
64
G711U
5 / 10 /
20
/ 30 / 40 / 50 / 60
64
G729A/
B
10 /
20 8
G723
30
/ 60
5.3 /
6.3
G722
5 / 10 / 20 /
30
/ 40
64
AMR
20
/ 40 / 60
4.75
iLBC
30
/ 60
13.3
/ 15.2
3.5 Advanced Settings
Advanced Settings includes fourteen parts:
FXS
,
FXO
,
Tone Detector
,
Tone Generator
,
DTMF
,
Ringing Scheme
,
Fax
,
Function Key
,
Dialing Rule
,
Dialing Timeout
,
Cue Tone, Color Ring
,
QoS
and
Action URL
. See Figure 3-27.
FXS
is used to configure the general properties of the
FXS port;
FXO
is used to configure the general properties of the FXO port;
Tone Detector
is used
to configure some properties of detected tones;
Tone Detector
is used to configure some
properties of tones sent from gateway;
DTMF
is used to set the properties related to DTMF;
Ringing Scheme
is used to set the ringing scheme for the FXS port;
Fax
is used to configure
multiple fax parameters;
Function Key
is used to set a cluster of combination keys for you to
query a related number;
Dialing Rule
and
Dialing Timeout
are used to set the judging conditions
for dialing;
Cue Tone
is used to set the gateway language for playing voice and the voice file used
for the two-stage dialing;
Color Ring
is used to upload the color ring file which can be set as a
ringback tone for an incoming call from IP to FXS port;
QoS
uses the differentiated services
technology to increase the gateway’s service quality.
Action URL
is used to designate the server
path to report the on-hook or off-hook state of the FXS channel.