Comments on draft-camarillo-mmusic-sip-isup-bcp-00.txt
"Bart Wensley" <bartw@nortelnetworks.com> Wed, 27 October 1999 14:01 UTC
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From: Bart Wensley <bartw@nortelnetworks.com>
To: "'Gonzalo.Camarillo@ericsson.com'" <Gonzalo.Camarillo@ericsson.com>
Cc: "'sip@lists.research.bell-labs.com'" <sip@lists.research.bell-labs.com>
Subject: Comments on draft-camarillo-mmusic-sip-isup-bcp-00.txt
Date: Wed, 27 Oct 1999 14:56:05 +0100
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Gonzalo, I have put together some comments on the "Best Current Practice for ISUP to SIP mapping" internet draft: Section 1 - Introduction The statement "Maintenance messages are outside the scope of this document." is not very clear. Since there is no fixed identifier (i.e. CIC) for SIP-BCP-T "trunks", the concept of ISUP maintenance (e.g. blocking, unblocking, etc...) does not make sense. The draft should state that ISUP maintenance messages are not used for SIP-BCP-T. Section 3 - Scenarios Although the concept of "SIP bridging" is mentioned in this section, it is not discussed at all in the remainder of the document. In subsequent sections of the document, it would be useful to discuss the inclusion of the ISUP message within the body of the SIP message. Section 5 - Mapping It would be useful to include message sequence charts showing call flows for SIP to ISUP and ISUP to SIP. Now that draft-johnston-sip-call-flows-00.txt has been released, you may want to refer to it. Section 6.6 - ACM is received In the PSTN, the nearest exchange to the called party (not the caller) generates the ringback tone and may send voice announcements. Section 6.9 - CPG with status 'alerting' is received The procedures in section 6.6 (not section 6.5) should be followed in this case. Section 7.1 - Address received The use of a timer to force enbloc signaling is not acceptable. In the case of SIP bridging, subscribers originating calls from the PSTN will not accept an artificial post-dial delay (even if it is just a few seconds long). Overlap signaling must be supported. It is essential that the overlap process takes place within the context of a single session - using the suggested INVITE/CANCEL/INVITE approach would result in multiple abortive calls being delivered to the terminating agent, which would not be acceptable. Why not send an INVITE message when the ISUP IAM is received and then send subsequent INFO messages for each ISUP SAM? I understand that "pure" SIP agents will expect the INVITE to contain the complete address of the called party. This could be handled by including support for overlap in the "Require" extensions (draft-roach-mmusic-sip-pstn-require-header-00.txt). If the terminator did not support the PSTN extensions, the originator could then switch to enbloc and wait for the full address to be collected. Details should be provided to specify how the various fields in the header of the INVITE message are filled in. What should be provided in the "From:" and "To:" fields? Is there a recommendation for the generation of Call-IDs? Bart Wensley (bartw@nortelnetworks.com) Nortel Networks
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Lyndon Ong
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Ravandhu Hariram
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Matt Cannon
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Gonzalo Camarillo
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Henning Schulzrinne
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Henning Schulzrinne
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Steve.Carr
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Matt Cannon
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Daniel G. Petrie
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Matt Cannon
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Gonzalo Camarillo
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Pete Cordell
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Pete Cordell
- Re: Overlap signaling to INVITE (Was RE: Comments… Michael A. Ramalho
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Matt Cannon
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- Re: Overlap signaling to INVITE (Was RE: Comments… Henning Schulzrinne
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Pete Cordell
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Schroeder, Tim
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Pete Cordell
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Daniel G. Petrie
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Gonzalo Camarillo
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Gonzalo Camarillo
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Daniel G. Petrie
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Henning Schulzrinne
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Adam B. Roach
- Re: Overlap signaling to INVITE (Was RE: Comments… Jonathan Rosenberg
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… mikko.alutoin
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Matt Cannon
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Pete Cordell
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Daniel G. Petrie
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Dean Willis
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Anil Yelundur
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Henning Schulzrinne
- Please push the pound key ( was RE: Comments on d… Henry Sinnreich
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Matt Cannon
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Gonzalo Camarillo
- Comments on draft-camarillo-mmusic-sip-isup-bcp-0… Bart Wensley
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Pete Cordell
- Re: Overlap signaling to INVITE (Was RE: Comments… Jonathan Rosenberg
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Adam B. Roach
- Overlap signaling to INVITE (Was RE: Comments on … Dean Willis
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… Tom-PT Taylor
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Adam B. Roach
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Chip Sharp
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Pete Cordell
- RE: Comments on draft-camarillo-mmusic-sip-isup-b… mikko.alutoin
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Gonzalo Camarillo
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Adam B. Roach
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Gonzalo Camarillo
- Re: Overlap signaling to INVITE (Was RE: Comments… Gonzalo Camarillo
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Pete Cordell
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Jonathan Rosenberg
- Re: Overlap signaling to INVITE (Was RE: Comments… Henning Schulzrinne
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Gonzalo Camarillo
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Adam B. Roach
- Re: Comments on draft-camarillo-mmusic-sip-isup-b… Thomas Marshall Eubanks