BCP for SIP to ISUP mapping draft-camarillo-sip-isup-bcp-00.txt - - PowerPoint PPT Presentation

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BCP for SIP to ISUP mapping draft-camarillo-sip-isup-bcp-00.txt - - PowerPoint PPT Presentation

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BCP for SIP to ISUP mapping draft-camarillo-sip-isup-bcp-00.txt Gonzalo Camarillo / Adam Roach Gonzalo.Camarillo@ericsson.com Adam.Roach@ericsson.com Gonzalo Camarillo / Adam Roach 47th IETF Adelaide March 28th, 2000 SIP WG Advanced

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SLIDE 1

Gonzalo Camarillo / Adam Roach Adelaide March 28th, 2000 Advanced Signalling Research Lab. 47th IETF SIP WG

Gonzalo Camarillo / Adam Roach

Gonzalo.Camarillo@ericsson.com Adam.Roach@ericsson.com

BCP for SIP to ISUP mapping

draft-camarillo-sip-isup-bcp-00.txt

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SLIDE 2

Gonzalo Camarillo / Adam Roach Adelaide March 28th, 2000 Advanced Signalling Research Lab. 47th IETF SIP WG

Outline

  • Contents of the draft
  • Changes from previous version (presented in DC)
  • Call flow example showing overlap signalling
  • Open issues
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SLIDE 3

Gonzalo Camarillo / Adam Roach Adelaide March 28th, 2000 Advanced Signalling Research Lab. 47th IETF SIP WG

Contents of the draft

Requirements

  • Extensions Required (multipart bodies, reliable

responses…) Message flow

  • Call flow examples
  • Two state machines

Mapping of parameters

  • SIP response codes to ISUP cause values
  • ISUP cause values to SIP response codes
  • Standard parameters in ISUP messages
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SLIDE 4

Gonzalo Camarillo / Adam Roach Adelaide March 28th, 2000 Advanced Signalling Research Lab. 47th IETF SIP WG

Changes from previous version

  • draft-camarillo-mmusic-sip-isup-bcp-00.txt
  • Draft “SIP PSTN interworking Umbrella Require ”

added as “Extensions Required” section

  • Scope better defined (User Part Available outside)
  • SIP bridging (ISUP-SIP-ISUP) described

in more detail

  • Overlap signalling (SAMs)
  • Lots of examples of call flows
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SLIDE 5

Gonzalo Camarillo / Adam Roach Adelaide March 28th, 2000 Advanced Signalling Research Lab. 47th IETF SIP WG

Overlap Signalling

SI P M G C/ M G PSTN | | <- - - - - - - - - - - I A M

  • - - - - - - - - - - | 1

| | ==========A udi o==========>| 2| <- - - - - - - - I N V I TE- - - - - - - - - - - | | 3| - - - - - - - - - - - 484- - - - - - - - - - - >| | 4| <- - - - - - - - - - A CK

  • - - - - - - - - - - - | |

| | <- - - - - - - - - - - SA M

  • - - - - - - - - - - | 5

6| <- - - - - - - - I N V I TE- - - - - - - - - - - | | | - - - - - - - - - - - 100- - - - - - - - - - - >| | | | <- - - - - - - - - - - SA M

  • - - - - - - - - - - | 7

8| <- - - - - - - - I N V I TE- - - - - - - - - - - | | | - - - - - - - - - - - 100- - - - - - - - - - - >| | | | <- - - - - - - - - - - SA M

  • - - - - - - - - - - | 9

10| <- - - - - - - - I N V I TE- - - - - - - - - - - | | | - - - - - - - - - - - 100- - - - - - - - - - - >| | | | <- - - - - - - - - - - SA M

  • - - - - - - - - - - | 11

12| <- - - - - - - - I N V I TE- - - - - - - - - - - | | | - - - - - - - - - - - 100- - - - - - - - - - - >| |

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SLIDE 6

Gonzalo Camarillo / Adam Roach Adelaide March 28th, 2000 Advanced Signalling Research Lab. 47th IETF SIP WG

Overlap Signalling

SI P M G C/ M G PSTN 13| - - - - - - - - - - - 18x- - - - - - - - - - - >| | | ==========A udi o==========>| | 14| <- - - - - - - - - PRA CK

  • - - - - - - - - - - | |

| | - - - - - - - - - - - - A CM

  • - - - - - - - - - >| 15

16| - - - - - - - - - - - 484- - - - - - - - - - - >| | 17| <- - - - - - - - - - A CK

  • - - - - - - - - - - - | |

18| - - - - - - - - - - - 484- - - - - - - - - - - >| | 19| <- - - - - - - - - - A CK

  • - - - - - - - - - - - | |

20| - - - - - - - - - - - 484- - - - - - - - - - - >| | 21| <- - - - - - - - - - A CK

  • - - - - - - - - - - - | |

22| - - - - - - - - - - - 200- - - - - - - - - - - >| | 23| - - - - - - - - - - - 18x- - - - - - - - - - - >| | | | - - - - - - - - - - - - CPG

  • - - - - - - - - - >| 24

25| <- - - - - - - - - PRA CK

  • - - - - - - - - - - | |

26| - - - - - - - - - - - 200- - - - - - - - - - - >| | 27| - - - - - - - - - - - 200- - - - - - - - - - - >| | | <=========A udi o==========>| | | | - - - - - - - - - - - - A N M

  • - - - - - - - - - >| 28

| | <=========A udi o==========>| 29| <- - - - - - - - - - A CK

  • - - - - - - - - - - - | |
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SLIDE 7

Gonzalo Camarillo / Adam Roach Adelaide March 28th, 2000 Advanced Signalling Research Lab. 47th IETF SIP WG

Open Issues

  • New title (A mapping between ISUP and SIP)
  • Version of ISUP chosen (Q.767, Q.763, ANSI,

national flavours…)

  • Parameters chosen to be mapped (mandatory)
  • Reception of several 18x with media
  • Establishment of the media path in PSTN-SIP
  • scenarios. When 200 is sent. ACK arrives later
  • Interpretation of 1xx until 183 draft gets frozen
  • How to route overlap signalling in a stateless proxy

performing load sharing between several MGCs.

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SLIDE 8

Gonzalo Camarillo / Adam Roach Adelaide March 28th, 2000 Advanced Signalling Research Lab. 47th IETF SIP WG

Overlap Signalling Open Issue

IAM (1234) SAM (56) INVITE (1234) INVITE (123456) IAM (1234) IAM (123456) SIP body = SAM SIP body = IAM Ingress MGC Stateless SIP proxy Egress MGC 2 Egress MGC 1