Click the Compression Settings... button on the Audio tab to reach the Compression Settings panel.
Status: May be either:
Soft: the codec is implemented as a software driver
Hard: the codec is implemented as a hardware device
Disabled: the codec is disabled.
A codec may be enabled or disabled on the Audio Codec Properties panel.
When two VoIP systems are establishing a call, they negotiate an audio compression codec they are going to use. Which codec to choose depends on many factors: what codecs are installed on both systems, bandwidth limitations, desired sound quality, etc. You may adjust SJphone codec preferences on the Compression Settings panel. During the negotiation, SJphone offers to the remote system the first codec from the list. If the remote system rejects the codec, SJphone offers the next one from top to bottom until they both accept the codec. You may arrange the codecs in the desired order using the Move Up and Move Down buttons. The Use Default button selects the default codec preference.
If you select a codec and click the Properties button, or double-click the codec, its Audio Codec Properties message will appear: This message shows some of the codec's basic properties. You may also enable or disable the codec on this message.
SJ Labs Extensions
Lost data recovery allows you to obtain good sound quality over poor Internet connections. The current SJphone version supports SJ Labs data recovery engine.
Attention! Use it only while communicating with SJphone and other compatible software.
SJ Labs data recovery engine sends additional IP packets. This doubles bandwidth requirements but completely restores up to 50% of lost packets. This feature is useful for wideband but unstable connections such as Mobile Internet, WaveLan, or Radio Ethernet.
Advanced Audio Settings
Click the Advanced Settings... button on the Audio tab to reach the Advanced Audio Settings panel.
This panel allows you to change sizes of various internal SJphone sound buffers and queues if you experience problems with sound
Do not change them unless you completely understand what you are doing, or you may severely degrade the SJphone performance.
If SJphone plays back DTMF signals too loudly, you may disable local DTMF playback by selecting the Disable local DTMF playback option.
Do not Send Silence: If this option is selected, SJphone does not send IP packets when you are silent, or you mute SJphone. That reduces network load.