The first node you install in a cluster is the
CUCM and CUBE
- publisher
- subscriber
- TFTP-only node
- Expressway-C
Reason in the bank: publisher
Show the leg
Interview prep and career path
Six questions from the idea-pool bank, one track each. The scored quiz has the other 462. Open a stop on the timeline.
Draw registration and a basic call. A 200 OK is not audio.
CSS miss, dial-peer 0, or a carrier timeout. Name which leg.
Calling Plan, local gateway, Operator Connect, Direct Routing. Do not mix their traces.
Call type or entry point, then recording, WFM, CRM, and a handoff.
Cisco's February 2026 set is one public map: CLCOR, then a concentration. It is one public map of the exams. The certifications page has the exam names.
Kari's Law requires
Emergency calling
- direct 911 and on-site notification
- a specific DSCP
- Expressway-E
- G.729
Reason in the bank: direct 911 and on-site notification
Audio, including audio of video, is marked
Voice network and QoS
- EF / DSCP 46
- AF42 / DSCP 36
- CS1
- BE
Reason in the bank: EF / DSCP 46
A local gateway connects Webex Calling to
Migrations
- premises PSTN or Unified CM
- the PSAP database only
- Smart Licensing
- the ITL
Reason in the bank: premises PSTN or Unified CM
Delayed offer means the INVITE
SIP and media
- has no SDP
- has SDP
- is a REGISTER
- is encrypted by default
Reason in the bank: has no SDP
933 on Webex Calling is
Contact center — UCCE and PCCE
- an emergency test number
- a codec
- an SRV
- a location link weight
Reason in the bank: an emergency test number
A path through the work
The work itself has a readable order:
- Voice and SIP. You can draw registration and a basic call, and you can say why a 200 OK is not audio.
- Call control and the SBC. You can explain a CSS miss versus dial-peer 0 versus a carrier timeout.
- Cloud PSTN. You can name Calling Plan, local gateway, Operator Connect, and Direct Routing without mixing their traces.
- Contact center and the systems around it. Call type or entry point, then recording, WFM, CRM, and a virtual agent that can hand off.
Cisco's February 2026 certification set is one public map of that work: CLCOR, then a concentration. It is one public map of the exams. The certifications page has the exam names and the blog link.