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SIP Session Timer

SIP Session Timer. Jonathan Rosenberg dynamicsoft. Significant overhaul from previous version Motivation: list discussion on supporting function when only one of UAS/UAC knows extension. Works since you don’t need to support it to receive re-invites Want either side to perform reinvites.

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SIP Session Timer

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  1. SIP Session Timer Jonathan Rosenberg dynamicsoft

  2. Significant overhaul from previous version Motivation: list discussion on supporting function when only one of UAS/UAC knows extension Works since you don’t need to support it to receive re-invites Want either side to perform reinvites Changes

  3. UAC supports, UAS doesn’t 200 OK won’t have S-T Last proxy that inserted S-T inserts S-T value + Require into response Requires stateful S-T proxies Call Flow INV; k:timer S-T: 500 INV; k:timer 200 OK Require: timer S-T: 500 200 OK ACK ACK INV; k:timer S-T: 500 INV; k:timer UAC Proxy UAS

  4. UAS supports, UAC doesn’t No Supported in INVITE Proxy inserts S-T anyway UAS reflects S-T, no Require, knows it is doing re-INVITES Call Flow INV S-T: 500 INV 200 OK S-T: 500 200 OK S-T: 500 ACK ACK INV; k:timer S-T: 500 INV; k:timer S-T: 500 UAC Proxy UAS

  5. Neither Supports Proxy inserts S-T timer even though no Supported No S-T in response Proxy doesn’t insert S-T or Require Call Flow INV S-T: 500 INV 200 OK 200 OK ACK ACK UAC Proxy UAS

  6. Both Support Same as previous drafts UAC will perform timer Open issues reinvite issues? Call Flow INVk:timer S-T: 500 INVk:timer 200 OK S-T: 500 Require: timer 200 OK S-T: 500 Require: timer ACK ACK INV; k:timer S-T: 500 INV; k:timer UAC Proxy UAS

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