Which codec allows direct audio exchange between extensions when systems are bridged?

The answer indicates that the ability for direct audio exchange between extensions when systems are bridged depends on the specific bridge settings. In practice, when bridging two or more systems, various codec settings can dictate how audio streams are handled.

The bridging configurations can allow for specific codec preferences, or they may transcode between different codecs depending on compatibility or bandwidth considerations. Considering this, if the bridge settings are configured to use a certain codec, that codec will be utilized for the direct audio exchange. This flexibility is essential because different environments and use cases may call for different codec performance characteristics, affecting voice quality and bandwidth usage.

In scenarios where the settings prioritize certain codecs, such as G711A, G729, or G722, those codecs can directly handle audio between extensions. The outcome relies heavily on how the bridging settings are defined in the systems involved, making the specifics of the bridge configuration crucial for determining the codec in use.