204 2xx Success RFC 5839
SIP 204 No Notification
The subscription was successful, but no NOTIFY will be sent because the state has not changed.
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Common causes
- Conditional event notification optimisations.
How to fix it
- Informational only.
Seeing 204 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 2xx responses
The request succeeded.