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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. 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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slide1
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.

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 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
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