sip · sip/555

Push Notification Service Not Supported

The server does not support the push notification service identified in the request. Used when a UA requests push notifications through a service that the registrar does not support.

Also defined in

smtp MAIL FROM or RCPT TO parameters not recognised The server does not recognise or support the extension parameters supplied with MAIL FROM or RCPT TO.

References

rfc-editor.org/rfc/rfc8599

In this namespace

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