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REFER with no Implicit Subscription draft-ietf-sip-refer-with-norefersub-01

REFER with no Implicit Subscription draft-ietf-sip-refer-with-norefersub-01. By Orit Levin oritl@microsoft.com. REFER with no Implicit Subscription draft-ietf-sip-refer-with-norefersub-01. Motivation

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REFER with no Implicit Subscription draft-ietf-sip-refer-with-norefersub-01

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  1. REFER with no Implicit Subscription draft-ietf-sip-refer-with-norefersub-01 By Orit Levin oritl@microsoft.com SIP WG IETF62

  2. REFER with no Implicit Subscriptiondraft-ietf-sip-refer-with-norefersub-01 • Motivation • Allow for REFER without creating a dialog and automatic subscription to the Dialog event package • Mechanism • New option tag norefersub is defined and registered with IANA • Forking MUST be prevented (for example, using GRUU) • Status • “Last Called” a month ago • All the comments were incorporated except for the new thread from the last week SIP WG IETF62

  3. How does REFER-Issuerenables the feature? • Commonly is preceded by OPTIONS (or other previous engagement between the UAs) • Supported Header in the Request • REFER-Issuer is willing supporting the feature for the particular REFER • Required Header in the Response • If the REFER-Recipient chooses to not establish the subscription, it includes the tag in the Require Header in the response • Require Header in the Request • Is used by REFER-Issuer when it mandates using the feature for the particular REFER SIP WG IETF62

  4. REFER-Issuer suggests using the feature to REFER-Recipient REFER- Issuer REFER- Recipient REFER- Issuer REFER- Recipient REFER (Supported) REFER (CreateSUB = NO) 200 OK (Required) 2xx Current Draft Jonathan SIP WG IETF62

  5. Should we allow for Require Header usage with “norefersub”? REFER- Issuer REFER- Recipient REFER- Issuer REFER- Recipient REFER (Required) REFER (Supported) 420 Bad Extension 2xx REFER NOTIFY 481 (Call/Transaction Does Not Exist 200 OK Current Draft Cullen SIP WG IETF62

  6. The Resolution… SIP WG IETF62

  7. REFER with no Implicit Subscription Example REFER sip:carol@chicago.example.com SIP/2.0 Via: SIP/2.0/UDP client.atlanta.example.com;branch=z9hG4bKg45 Max-Forwards: 70 To: Carol <sip:carol@chicago.example.com> From: Alice <sip:alice@atlanta.example.com>;tag=5534562 Call-ID: 849392fklgl43 CSeq: 476 REFER Contact: <sip:uf313a413@example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Accept: application/sdp Refer-To: <sip:3402934234@example.com> Supported: norefsub, gruu, … Require: norefersub Content-Length: 0 SIP WG IETF62

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