Table of Contents

Bridge two calls

A bridge cross-connects the audio of two active calls — the basis for attended transfer, conferencing and "connect caller A to agent B" flows. Use a MediaConnector from the media factory.

Connect two calls

// Two independent, connected calls:
ICall a = await line.DialAsync("sip:agent@pbx.example.com");
ICall b = await line.DialAsync("sip:customer@pbx.example.com");
// …both answered…

MediaConnector connector = client.Media.CreateConnector();
// cross-connect a <-> b through the connector, then tear down when done

Both calls keep their own SIP dialog; only their media is joined. Hanging up one leg leaves the other intact.

Bridge audio format

VoipConfiguration.BridgeAudioFormat controls how bridged audio is handled:

  • Passthrough (default) — forward frames without re-encoding when the legs are compatible (lowest overhead).
  • transcoding formats — mix/convert when the two legs negotiated different codecs.
new VoipConfiguration { BridgeAudioFormat = BridgeAudioFormat.Passthrough };

Conference recording / playback

Once bridged, record or play into the conference rather than a single call:

await client.Media.StartConferenceRecordingAsync(/* … */);
await client.Media.StartConferencePlaybackAsync(/* … */);

See Recording/playback.

Attended transfer vs. bridge

ICall.AttendedTransferAsync hands the dialog to the PBX and drops out. A MediaConnector bridge keeps you in the media path — pick the bridge when you need to stay connected (supervision, recording, injecting audio).

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