List of enable codecs

In this table are listed the codecs used in IPBrick and the preference order by which they are chosen in communications. To add or remove codecs to the list, you just have to follow the option Modify, select the codec and press the button add (») or remove («). In the same way, to change the order by which the codecs are used, you should select the codec and clicking on the arrows on the right of the list, making it going up or down in the list according the necessary priority.

It is possible to select among the following codecs, knowing that the band width used for each one of them is:

• GSM: 13 kbps;
• iLBC: 15 kbps;
• Speex: Configurable 4-48 kbps;
• G.726: 32 kbps;
• LPC10: 2.5 kbps (not recommended);
• G.711 ulaw: 64 kbps;
• G.711 alaw: 64 kbps, used in Europe;
• G.729: 8 kbps (you may have to buy a license to make calls with this codec at Digium website. If this codec is enabled a link called Licence Activation will appear, so with a valid key a G729 licence will be generated;

Of course the bigger the required bandwidth, the smaller the number of possible simultaneous calls. For each of the selected codec we can include an average of more 15 kbps of overhead.