1 / 18

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. Objective of the Study Methodology IP Multimedia Subsystem Session Control Protocols Conclusions. Outline. Objective of the Study Methodology

mick
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. SIP-I for Interworking between PSTN and IP Networks Tiina Mustalahti 15.9.2008 Supervisor: Jyri Hämäläinen

  2. Outline • Objective of the Study • Methodology • IP Multimedia Subsystem • Session Control Protocols • Conclusions

  3. Outline • Objective of the Study • Methodology • IP Multimedia Subsystem • Session Control Protocols • Conclusions

  4. 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

  5. Outline • Objective of the Study • Methodology • IP Multimedia Subsystem • Session Control Protocols • Conclusions

  6. 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

  7. Outline • Objective of the Study • Methodology • IP Multimedia Subsystem • Session Control Protocols • Conclusions

  8. 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.

  9. IP Multimedia Subsystem (2/2)

  10. Outline • Objective of the Study • Methodology • IP Multimedia Subsystem • Session Control Protocols • Conclusions

  11. 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

  12. Session Control Protocols (2/3)

  13. 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

  14. Outline • Objective of the Study • Methodology • IP Multimedia Subsystem • Session Control Protocols • Conclusions

  15. 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

  16. 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

  17. Questions?

More Related