Codecs Help

The Codecs page is used to define a list of voice codecs used to initiate the call conference.

Note: The table on this page is displayed in a read-only mode for the users authenticated as participants.

The Codecs page consists of a table Active Codecs that lists active voice codecs for the selected line that are supported by Quadro Conference Server. Each record in the table has its checkbox assigned to the row. The checkbox is used to delete and to move up/down the corresponding record. An error occurs if no records are selected and the user activates the delete button: "No records selected". At least one codec must be attached to the conference, when attempting to delete the last one the error will occur: "At least one codec should stay in the codec list".

The order of records in the Active Codecs table is important for voice transmitting and receiving. A codec placed at the top of the table will be used as the preferred codec. If the remote party does not support the preferred codec, the following codecs will be tried out strictly in the consecution given in the Active Codecs table.

Following functional links are present to manipulate with the codecs in the Active Codecs table:

• Add opens the Add Entry page where the user may add codecs supported by QuadroCS. The voice codec defines the voice compression algorithm for the incoming and outgoing DSP packages. Codecs lists all codecs supported by QuadroCS. If no more codecs are available (all available codecs have already been transferred to the Active Codecs table), the Add Entry page will display the message "No Available Codecs" instead of the drop down menu.
• Delete removes the selected codec(s). If no records are selected an error message occurs.
• Select all selects all existing codecs.
• Inverse selection inverses the current selection of codecs (if no records are selected, all records will be checked).
• Move Up/Move Down functional buttons are used to move the selected codec one level up/down in the table.

The checkbox Out of Band DTMF Transport enables the DTMF code transmission in parallel with the voice stream. Destination received the DTMF code will play it locally if it supports the feature too. This is helpful to avoid DTMFs loss in case of bad traffic. The feature is valuable for all codecs but it is especially recommended to enable it in case of using low bit rate codecs (G729, G726/16, etc.).