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System and Method of SIP Conference Calling via PBX

IP.com Disclosure Number: IPCOM000131813D
Publication Date: 2005-Nov-21
Document File: 2 page(s) / 65K

Publishing Venue

The IP.com Prior Art Database

Abstract

One standard feature of enterprise telephony is conference calling. The problem with the existing methods involving SIP is that they do not take advantage of legacy telecomm equipment, such as a PBX that has dedicated DSPs and related hardware/software to handle conference calls. We are proposing two ways to use SIP to signal the PBX for conference calling.

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SIP CONFERNCE CALLING VIA PBX

System and Method of SIP Conference Calling via PBX

Disclosed Anonymously

One standard feature of enterprise telephony is conference calling.  The problem with the existing methods involving SIP is that they do not take advantage of legacy telecomm equipment, such as a PBX that has dedicated DSPs and related hardware/software to handle conference calls.  We are proposing two ways to use SIP to signal the PBX for conference calling.

The SIP equivalent of a hook flash in the analog phone world, we can signal the PBX of our intention to commence conference calling.

An alternate method that can be introduced is using SIP messages to signal to the PBX to join multiple calls.  This would be an explicit message to the PBX to invoke its conference calling feature.

The first solution is a novel workaround, whereas the second solution advances functionality in the VoIP world.

There are other ways to do conference calling in SIP.

1.  Conference bridge exists on the originating device:

    A device that wants to conduct a conference call mixes the various calls locally on the device.

2.  Conference bridge exists on a media server:

     A dedicated media server mixes the audio streams.

These two solutions require additional hardware resources that may not necessarily be available.  Existing PBXs which are designed for multiple conference calls with dedicated resources are a much better place to handle conference calls.  We are simply signalling...