Categorize common telecommunications fault clues by the layer they most directly implicate.
Sort each ticket clue by the layer or plane it most directly implicates. Physical or Link Network or Naming Transport Policy SIP Signaling RTP Media Desk phone has no link light after patch move Phone receives a data VLAN address instead of a voice VLAN address Softphone cannot resolve the SIP service DNS name Traceroute exits through the backup internet path unexpectedly Firewall logs drop UDP packets in the negotiated media range TLS signaling port never completes a TCP handshake REGISTER receives SIP 403 with valid network reachability INVITE returns SIP 404 for one normalized DID Call answers but audio…
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