A scalable distributed VoIP conferencing using SIP

Prasad, Ramjee; Hurni, Richard; Jamadagni, H. S.

doi:10.1109/iscc.2003.1214185

Cited by 16 publications

(14 citation statements)

References 15 publications

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“…With Multicasting, clients will have to parse many streams and traffic on clients' network increases unnecessarily. A discussion about the limitations of existing SIP conference models (end-system mixing, users joining, large multicast conference, dial-in conference server, ad-hoc centralized conferences, dial-out conference server, centralized signalling and distributed media) is provided in [12].…”

Section: The Motivationmentioning

confidence: 99%

“…A SIPS can be viewed as a physical entity that encompasses different logical roles, namely a SIP Proxy Server (which was assumed to be able to generate SIP messages in [12], an assumption that we suppress here because of the presence of the B2BUA), a SIP Registrar Server, a SIP Redirect Server and a SIP B2BUA (Back-to-Back User Agent), which are defined in [17]. This physical implementation enables the handling of in-coming/outgoing SIP messages by one or another logical entity according to the needs and let the other logical components know about the messages passing through, even if they are not concerned, allowing them to take other actions if necessary.…”

Section: Description Of the Involved Entitiesmentioning

confidence: 99%

“…The B2BUA, being able to perform more actions than a regular PS, will be the core entity for our conference-related signalling (explained in next subsection). For the communication needs of the four logical entities in the SIPS, many interfaces are devoted to communication with the domain Clients (User Agents) [12]. Interfaces are also required to communicate with the SIPSs in other domains and with the local Conference Server (see below).…”

Section: Description Of the Involved Entitiesmentioning

confidence: 99%

“…Furthermore, objects regarding the calls or conferences currently under way to/from the domain are stored in the SIPS, so that it has complete information about them (fulfilling the stateful condition necessary for the B2BUA as described above). These conference objects (fully described in [12]) contain relevant conference-level information, a list of all the Clients taking part in this conference, irrespective of their local or remote location. A list of the SIPSs from other domains involved in that conference and a list of the CS(s) operating in the local domain are included as well.…”

Section: Description Of the Involved Entitiesmentioning

confidence: 99%

“…2 and also in [12]) is to pick N Clients out of M from the local domain that are in the same conference based on some criterion. Audio packets from those N Clients, along with their ID are to be sent to the other CSs handling the same conference.…”

Section: Fig 2 Schematic Diagram Of a Conference Servermentioning

confidence: 99%

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A Proposal for Distributed Conferencing on SIP Using Conference Servers

Prasad

Hurni

Jamadagni

2003

Management of Multimedia Networks and Services

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Abstract. Session Initiation Protocol (SIP) is the de facto standard for Voice over IP implementations. Although this standard does not define conferencing directly, many drafts and papers suggest extensions and solutions to this essential service. In this paper, we first define the issues that are to be considered when building a conference service, and then we motivate our work on some of the limitations of the existing suggested solutions. This framework facilitates the conference control and media handling of a VoIP conference and aims to create a scalable and distributed conferencing system both in terms of load and control. The conference control as well as media is distributed over the network using SIP Servers and Conference Servers, which are described. The floor control is made dynamic by using a metric called Loudness Number [10] that provides a feel of a physical face-to-face conference.

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Section: The Motivationmentioning

confidence: 99%

Section: Description Of the Involved Entitiesmentioning

confidence: 99%

Section: Description Of the Involved Entitiesmentioning

confidence: 99%

Section: Description Of the Involved Entitiesmentioning

confidence: 99%

Section: Fig 2 Schematic Diagram Of a Conference Servermentioning

confidence: 99%

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