UC2000-VE/F/G GSM/CDMA/WCDMA VoIP Gateway User Manual
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Shenzhen Dinstar Co., Ltd.
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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.
There are two modes for the AMR codec in the device:
AMR_FR: the AMR codec in a full rate channel (FR)
AMR_HR: the AMR codec in a half rate channel (HR).
FR and EFR: GSM Audio Coding supports both FR and EFR, but FR is prior to EFR.
EFR and FR: GSM Audio Coding supports both EFR and FR, but EFR is prior to FR.
Example:
Configuration between SMS box and gateway
Configure API parameters on gateway
The IP server which installed SMS box software is 172.16.221.221, pre-set Port 12000, User
ID aabbcc and password abc123 as example.
Configure SMS box
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