Why it happens
- The trunk’s concurrent call limit is reached.
- The carrier’s capacity towards that destination is exhausted.
What to check
- Check the channel limit on your trunk and how many calls are up; add capacity or a second route.
Q.850 cause 34: No circuit/channel available
No circuit or channel available: every channel on the route is busy.
34
- Q.850 name
- No circuit/channel available
- Group
- Resource unavailable
- FreeSWITCH
- NORMAL_CIRCUIT_CONGESTION
- Asterisk
- HANGUPCAUSE=34
- SIP response from a gateway
- 503 Service Unavailable
- In SIP
- Reason: Q.850;cause=34