SIP PRACK Call Flows
- Kelli Higdon
Owned by Kelli Higdon
- 1 Changes to Basic Call Flow with PRACK enabled
- 2 UAS Honors UAC’s Preference
- 3 UAS Agrees to UAC’s Enforcement
- 4 UAS Ignores UAC’s Preference
- 5 UAS Rejects UAC’s Enforcement
- 6 UAS Insists UAC MUST Support 100rel
- 7 UAC Insists on Reliable Delivery of Provisional Responses
- 8 IMG 2020 Acts as UAC and UAS
- 9 Basic Call Flow which includes the SDP message
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Changes to Basic Call Flow with PRACK enabled
The call flow on the left highlights the changes when PRACK is set to enabled. Call flow on the right displays PRACK is set to disabled.
UAS Honors UAC’s Preference
UAS and UAC are set to PRACK Supported option.
UAS Agrees to UAC’s Enforcement
UAS and UAC are set to PRACK Require option.
UAS Ignores UAC’s Preference
UAS is PRACK Supported and UAC is PRACK Disable.
UAS Rejects UAC’s Enforcement
UAS is PRACK Require and UAC is PRACK Disable.
UAS Insists UAC MUST Support 100rel
UAS is PRACK Disable and UAC is PRACK Require.
UAC Insists on Reliable Delivery of Provisional Responses
UAS is configured with PRACK Require option.
IMG 2020 Acts as UAC and UAS
Basic Call Flow which includes the SDP message
The IMG 2020 must include an SDP answer in the 200 OK to PRACK when an SDP offer is received in the PRACK request