PhonerLite
VoIP softphone for Windows
A codec is the short word for "coder and decoder"..
In this window you can disable individual codecs and change their priority. Themost preferred codec should be on top of the list. If this preferred codec is used belongs of the counterpart - if it supports this codec too.
The shown data rates are net values. In practice these values are much higher because of the encapsulation of speech data in RTP , UDP and finally in IP packets.The gross data rate for a G.711 codec is about 80 kBits/s. This is too much for modem and ISDNdial up connections! If such connectiona are used, these codecs should be disabled here.
Following codecs are supported by PhonerLite:
Echo Cancellation means analyzing of data to be sent and the filtering of containingreceived data. By activating this option you can avoid that you your microphone records data from the speakers.
If speech data should be encrypted, you can activate the option SRTP . Atthe moment there is no encrypted/secure key exchange implemented in PhonerLite, so this option is not very useful, but a first step.
The peer (phone or provider) must support SRTP too. The actual implementation is tested against Grandstream GXP2000 and the German VoIP provider dus.net .
