SIP-I for Interworking between PSTN and IP Networks
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SIP-I for Interworking between PSTN and IP Networks Tiina Mustalahti 15.9.2008 PowerPoint PPT Presentation


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SIP-I for Interworking between PSTN and IP Networks Tiina Mustalahti 15.9.2008. Supervisor: Jyri Hämäläinen. Outline. Objective of the Study Methodology IP Multimedia Subsystem Session Control Protocols Conclusions. Outline. Objective of the Study Methodology

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SIP-I for Interworking between PSTN and IP Networks Tiina Mustalahti 15.9.2008

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Sip i for interworking between pstn and ip networks tiina mustalahti 15 9 2008

SIP-I for Interworking between PSTN and IP Networks

Tiina Mustalahti

15.9.2008

Supervisor: Jyri Hämäläinen


Outline

Outline

  • Objective of the Study

  • Methodology

  • IP Multimedia Subsystem

  • Session Control Protocols

  • Conclusions


Outline1

Outline

  • Objective of the Study

  • Methodology

  • IP Multimedia Subsystem

  • Session Control Protocols

  • Conclusions


Objective of the study

Objective of the Study

  • Evaluate the use of SIP-I for interworking between the PSTN and IP networks

  • Compare SIP-I to the other session control protocols

  • Study the SIP-I protocol from operators’ point of view


Outline2

Outline

  • Objective of the Study

  • Methodology

  • IP Multimedia Subsystem

  • Session Control Protocols

  • Conclusions


Methodology

Methodology

  • Literature survey

    • The documents studied included standards, books, figures, guidelines, whitepapers, press releases, and other material

  • Interviews

    • The empirical part of the study was collected by conducting interviews (5) with the experts from different operators and the Ericsson organization


Outline3

Outline

  • Objective of the Study

  • Methodology

  • IP Multimedia Subsystem

  • Session Control Protocols

  • Conclusions


Ip multimedia subsystem 1 2

IP Multimedia Subsystem (1/2)

  • Core Network consists of the following parts:

    • Circuit Switched domain

    • Packet Switched domain

    • IP Multimedia Subsystem (IMS) – along in Release 5

  • IMS provides real-time multimedia sessions, such as Voice over IP (VoIP) calls

  • The main signaling protocol is Session Initiation Protocol (SIP)

Anywhere. Anytime. Any device.


Ip multimedia subsystem 2 2

IP Multimedia Subsystem (2/2)


Outline4

Outline

  • Objective of the Study

  • Methodology

  • IP Multimedia Subsystem

  • Session Control Protocols

  • Conclusions


Session control protocols 1 3

Session Control Protocols (1/3)

  • Session Initiation Protocol (SIP)

    • SIP is responsible for establishing and managing multimedia sessions, such as VoIP calls

    • SIP does not provide any method directly interworking with the PSTN network: alternative protocols are needed (BICC, SIP-T and SIP-I)

  • Bearer Independent Call Control (BICC)

    • Standardized by ITU-T in 2000

    • Based on the signalling protocol used in PSTN, ISUP

  • SIP for Telephones (SIP-T)

    • Defined by IETF in 2002

    • Extention to SIP for interworking between the IP and PSTN networks

    • Based on both SIP and ISUP

  • SIP with encapsulated ISUP (SIP-I)

    • Standardized by ITU-T in 2004

    • Extention to SIP for allowing full interworking with the PSTN network

    • Based on both SIP and ISUP


Session control protocols 2 3

Session Control Protocols (2/3)


Session control protocols 3 3

Session Control Protocols (3/3)

  • Comparison between BICC and SIP-T/SIP-I

    • BICC is more mature than SIP-T and SIP-I

    • IMS was standardized around SIP: SIP-T and SIP-I considered as longer term solutions than BICC

    • There does not appear to be any futher plans to modify BICC

      • Full technical specification of SIP-I will be provided by 3GPP during Release 8 timeframe

    • BICC cannot be used for interworking between the wireless and wireline domains unlike SIP-T and SIP-I

  • Comparison between SIP-T and SIP-I

    • SIP-I is generally accepted as more complete specification than SIP-T


Outline5

Outline

  • Objective of the Study

  • Methodology

  • IP Multimedia Subsystem

  • Session Control Protocols

  • Conclusions


Conclusions

Conclusions

  • Benefits relating to SIP-I

    • Based on both SIP and ISUP protocols

    • Since IMS was standardized around SIP, SIP-I is considered as a long-term solution

    • Full technical specification is coming: SIP-I will be considered as an alternative to BICC between two MSC Servers

  • Retards for the deployment of SIP-I

    • Migration towards to an all-IP network including new protocols, such as SIP-I, takes always time and money

    • Most of the operators want to proceed slowly and learn from the IP pioneers

    • SIP-I still in its early phase

      • Specifications are general and lack of important details


Conclusions1

Conclusions

  • The mobile industry should adopt only one session control protocol

    • There would not be too many separate interworking cases

    • Services supported end-to-end without loss of functionalities

    • SIP-I was found to fit best for this purpose


Questions

Questions?


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