Internet SIP registration/proxy service for audio conferencing

1. A system, comprising:

a session border controller;

an audio conferencing bridge; and

a bridge interface layer configured to:

receive a SIP Invite related to an audio conference;

route the SIP Invite to the bridge interface layer;

receive a message from the audio conferencing bridge that the audio conference is homed at a second audio conferencing system;

determine a passcode from the SIP Invite;

determine that the passcode is homed in a second audio conferencing bridge;

respond to the SIP Invite with a SIP 302 message that indicates the second audio conferencing bridge in which the passcode is homed; and

redirect the SIP Invite to the second bridge interface layer of the second audio conferencing bridge via a SIP Refer;

wherein the audio conferencing system is configured to establish an RTP media stream to a second audio conferencing bridge of the second audio conferencing system via the session border controller.

2. The audio conferencing system of claim 1 wherein the bridge interface layer is configured to provide the SIP Invite to the audio conferencing bridge.

3. The audio conferencing system of claim 1 , wherein the bridge interface layer is configured to receive the SIP Invite comprising one or more parameters of the audio conference.

4. The audio conferencing system of claim 3 , wherein the bridge interface layer is configured to process the one or more of the parameters of the SIP Invite.

5. The audio conferencing system of claim 3 , wherein the bridge interface layer is configured to receive the SIP Invite comprising one or more parameters of the audio conference from an internet softphone.

6. The audio conferencing system of claim 5 wherein the bridge interface layer is configured to:

receive the SIP Refer message from the audio conference bridge; and

provide the SIP Refer to the internet softphone.

7. The audio conferencing system of claim 1 wherein the bridge interface layer is configured to provide an Authentication of the SIP Invite.

8. The audio conferencing system of claim 5 wherein the bridge interface layer is configured to:

provide a challenge to the internet softphone; and

receive a challenge response from the internet softphone.

9. The audio conferencing system of claim 5 wherein the bridge interface layer is configured to register the internet softphone with the bridge interface layer.

10. A method, comprising:

receiving a SIP Invite message into a bridge interface layer, the SIP Invite comprising one or more parameters of an audio conference;

receiving a SIP Refer message in the bridge interface layer from an audio conference bridge;

providing the SIP Invite to a second audio conference bridge identified in the SIP Refer message, the second audio conference bridge being external to the audio conferencing system;

determining a passcode from the SIP Invite;

determining that the passcode is homed in the second audio conferencing bridge responding to the SIP Invite message with a SIP 302 message that indicates the second audio conferencing bridge in which the passcode is homed; and

establishing an RTP media stream to the second audio conferencing bridge via a session border controller of the audio conferencing system.

11. The method of claim 10 comprising processing the one or more of the parameters of the SIP Invite in the bridge interface layer.

12. The method of claim 10 comprising providing the SIP Invite from the bridge interface layer to the audio conferencing bridge in accordance with the one or more processed parameters of the SIP Invite.

13. The method of claim 10 comprising receiving the SIP Invite message from an internet softphone.

14. The method of claim 13 comprising providing the SIP Refer message to the internet softphone.

15. The method of claim 13 comprising:

providing a challenge to the internet softphone; and

receiving a challenge response from the internet softphone.

16. The method of claim 13 comprising registering the internet softphone with the bridge interface layer.

17. A non-transitory computer-readable storage medium comprising instructions for:

receiving a SIP Invite message into a bridge interface layer, the SIP Invite comprising one or more parameters of an audio conference;

receiving a SIP Refer message in the bridge interface layer from an audio conference bridge;

providing the SIP Invite to a second audio conference bridge identified in the SIP Refer message, the second audio conference bridge being external to the audio conferencing system;

determining a passcode from the SIP Invite;

determining that the passcode is homed in the second audio conferencing bridge;

responding to the SIP Invite message with a SIP 302 message that indicates the second audio conferencing bridge in which the passcode is homed; and

and

establishing an RTP media stream to the second audio conferencing bridge via a session border controller of the audio conferencing system.

18. The non-transitory computer-readable storage medium of claim 17 comprising instructions for processing the one or more of the parameters of the SIP Invite in the bridge interface layer.

19. The non-transitory computer-readable storage medium of claim 17 comprising instructions for:

receiving the SIP Invite message from an internet softphone; and

providing the SIP Refer message to the internet softphone.

20. The non-transitory computer-readable storage medium of claim 17 comprising instructions for providing the SIP Invite from the bridge interface layer to the audio conferencing bridge in accordance with the one or more processed parameters of the SIP Invite.