Technique for controlling establishment of a tandem-free transcoder operation
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsKarl Hellwig, Dirk Kampmann, Andreas Witzel
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Abstract
The invention relates to a technique for controlling establishment of a tandem free operation (TFO) for transfer of TFO frames including content frames between a first and a second transcoder unit without transcoding of the content frames. A method aspect of the technique comprises the steps of transmitting, in case a remotely used codec does not meet a codec compatibility condition, a first transparent mode message indicating to in-path equipment a transparent mode for subsequent transparent TFO negotiation, and transmitting, in the transparent mode, a TFO configuration frame indicating a local TFO codec list.
Claims12
A method of controlling establishment of a tandem free operation (TFO) for transfer of TFO frames including content frames between a first and a second transcoder unit without transcoding of the content frames, the method comprising the following steps:
- receiving, in context with a TFO request, information about a remotely used coded associated with a remote transcoder unit;
- determining, in response to the TFO request, if the remotely used coded meets a codec compatibly condition;
- transmitting, in case the remotely used coded does not meet the coded compatibly condition, a first transparent mode message indicating to in-path equipment a transparent mode for subsequent transparent TFO negotiation;
- transmitting, in the transparent mode, a TFO configuration frame indicating a local TFO codec list;
- and
- continuously transmitting TFO synchronization messages in the transparent mode.
The method according to can 1, comprising the further steps of
- receiving a second transparent mode message from the remote transcoder unit;
- and
- transmitting the TFO configuration frame in response to the received transparent mode message.
A transcoder unit adapted for controlling establishment of a tandem free operation (TFO) for transfer of TFO frames including content frames between a first and a second transcoder unit without transcoding of the content frames, the transcoder unit comprising:
- a reception component adapted for receiving in context with a TFO request information about a remotely used codec associated with a remote transcoder unit;
- a determination component adapted for determining, in response to the TFO request, if the remotely used codec meets a codec compatibility condition;
- a message transmission component adapted for transmitting, in case the remotely used coded does not meet the codec compatibility condition, a first transparent mode message indicating to in-path equipment a transparent mode for subsequent transparent TFO negotiation;
- and
- a frame transmission component adapted for transmitting, in the transparent mode, a TFO configuration frame indicating a local TFO codec list;
- and
- the message transmission component continuously transmitting TFO synchronization messages in the transparent mode.
Dependencies are inferred from the claim text.