580 5xx Server error RFC 3312
SIP 580 Precondition Failure
The server could not meet the QoS or security preconditions required for the session.
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Common causes
- Resource reservation failure in IMS or VoLTE networks.
How to fix it
- Disable required preconditions, or fix the resource reservation on the network.
Seeing 580 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 5xx responses
The server failed to handle an apparently valid request.