WG3100-Series GSM VoIP Gateway User Manual
_______________________________________________________________________________
Techroutes Network Pvt. Ltd.
33
SIM Bank
SIM Bank is use for SIM card storage and remote SIM management together with Techroutes
SIM Cloud
Introduction to API
The API protocol is used for external applications (for instance: SMS Server) to control the sending and receiving of
SMS/USSD on the gateway.
To enable the API function of the GSM gateway, the IP address, port, user ID and password of SMS Sever must be correctly
configured, and the TCP Intercept function of the SMS Server must be enabled. Once the connection between the gateway
and TCP is established, the gateway will send user ID and password to the SMS Server, and then the SMS Server will send
back a message which indicates successful authentication.
The API Server Address, API Server Port, User ID and API User Password on the above interface of Gateway must be the
same with the IP Address, Port, Auth ID and Password on the setting interface of SMS Server.
Introduction to GSM Audio Coding
There are eight formats for GSM Audio Coding, including Auto, FR, HR, EFR, AMR_FR, AMR_HR, FR and EFR, EFR and
FR.
Auto
: it means GSM Audio Coding is automatic.
FR (Full Rate)
: the first digital speech coding
speech
standard used in the
GSM
digital mobile phone system. The bit rate of
the codec is 13 kbit/s, or 1.625 bits/audio sample (often padded out to 33 bytes/20 ms or 13.2 kbit/s).
HR (Half Rate)
: the bit rate of the codec is
6.5 kbit/s. It requires half the bandwidth of the
Full Rate
codec and network
capacity for voice traffic is doubled, at the expense of audio quality. It is recommended to use this codec when the battery is
low as it may consume up to 30% less energy.
EFR (Enhanced Full Rate)
:
is a speech coding standard that was developed in order to improve the quite poor quality of
Full
Rate
codec. Working at 12.2 kbit/s, the EFR provides good quality in any noise conditions. The EFR is compatible with the
highest
AMR
mode (both are
ACELP
). Although the EFR helps to improve call quality, this codec has higher computational
complexity, which in a mobile device can potentially result in an increase in energy consumption as high as 5% compared to
'old' FR codec.
AMR (Adaptive Multi-Rate)
:
is an audio compression format optimized for speech coding. AMR speech codec consists of a
multi-rate narrowband speech codec that encodes narrowband (200
–3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s
with toll quality speech starting at 7.4 kbit/s.