ZTA LabFree University

T7 · T7-R21 · Call flows and routing

Transfer, conference, and what stays confirm

Students expect a transfer ladder. The honest version is short. Modifying a session is in the SIP abstract. The method name and the success responses belong to a section this session did not quote. Draw a box labeled modify, and a confirm row for the method.

ExportSVGFlowSheet

Learn it in 5 minutes

  • RFC 3261 includes modifying a session, not only creating one.
  • This session did not extract the REFER method section.
  • Zoom's SDK line names scheduled callbacks, which is not the same sentence as a SIP transfer.
  • Talkdesk's index names an Advanced Dialer. The dialer guide was not opened.
  • Avaya transfer steps were not opened.

Visual

Transfer, conference, and what stays confirm Modify. Teaching sketch. Confirm a live system. Create Modify Callback Confirm Names come from pages opened in 2026-10. A missing name stays confirm.

Count the boxes: 4. Each label is a name from a page or a study label marked on the drawing.

Flow

Transfer, conference, and what stays confirm Caller SIP Called session setup session setup RTP, not required to hairpin Teaching sketch from RFC 3261 and RFC 3550. Not a packet capture.

What is going on

Students expect a transfer ladder. The honest version is short. Modifying a session is in the SIP abstract. The method name and the success responses belong to a section this session did not quote. Draw a box labeled modify, and a confirm row for the method.

A callback on the Zoom SDK is a product feature name. An outbound dialer on the Talkdesk index is another product feature name. Neither one is a diagram of SIP REFER.

Conference, park, and barge are the same kind of gap. Add them when you open the page, not before.

Worked example

On the flow page, show setup and a second arrow labeled session modify, cited to the RFC 3261 abstract. Add a note: method name confirm.

Quiz

1. RFC 3261's abstract includes modifying sessions.

2. This lab documents Avaya's transfer button.

Ecosystem

Sister pieces sit on the ecosystem page: the glossary, the mind map, the integration map, and the bridges.

  • Session modify — The SIP job of changing a session that already exists. The method name stays confirm here.
  • Advanced Dialer — A Talkdesk docs index name. The guide itself was not opened.

Config. If you cannot cite the method, write modify and confirm.

Troubleshooting. A failed transfer blamed on RTP may be an uncited signaling method. Open the method section.

Bridge. Recording a transfer doubles the problem: two sessions, and a recorder. SIPREC is the recording track.

Mind map, sister technologies, and future hooks live on the ecosystem page.

Sources and go deeper

Opened 2026-10. A row marked confirm has no link, because that page was not verified.

  • RFC. RFC 3261, SIP last checked 2026-10
  • Zoom. Zoom Contact Center developer documentation last checked 2026-10
  • Talkdesk. Talkdesk documentation index last checked 2026-10
  • Confirm. SIP REFER details. confirm. The section was not extracted. last checked 2026-10
  • Confirm. Avaya transfer clicks. confirm. Not opened. last checked 2026-10
  • Confirm. Talkdesk Advanced Dialer behavior. confirm. Only the index name was seen. last checked 2026-10

sources.json Markdown