Troubleshooting tree
Sources: Call Analytics, Call Quality Dashboard, Direct Routing plan.
Accessed 14 October 2026.
No dial tone
License or voice routing policy missing, or the user is in the wrong tenant.
SIP fails before OPTIONS
Certificate name, private CA, or TLS version. 5061 never opens.
OPTIONS misses
Trunk out of service. Failover only if the route lists the next gateway.
Connects, silence
Media ports or a bypass path that the network blocks.
One user sounds bad
Call Analytics, not a CQD building case.
Whole subnet looks bad
CQD. Check loss, jitter, RTT, and whether DSCP survived.
VPN
Full tunnel hides the site and often strips the mark.
Both sides transform numbers
Pick one normalization owner before the next cutover.