Advanced Operational Features
41-001343-02 REV05 – 07.2014 6-13
Blacklist Duration
The Blacklist Duration feature helps to reduce unnecessary delays during proxy/registrar server failures, caused by the IP
phone repeatedly sending SIP messages to a failed server. If you enable this feature, then whenever the IP phone sends a
SIP message to a server, and does not get a response, the phone automatically adds the server to the blacklist. The IP
phone avoids sending messages to any servers on the blacklist. If all servers are on the blacklist, then the IP phone
attempts to send the message to the first server on the list.
You can specify how long failed servers remain on the blacklist in the IP phone’s configuration file or in the Aastra Web UI.
The default setting is 300 seconds (5 minutes). If you set the duration to 0 seconds, then you disable the blacklist feature.
4. Click on Advanced Settings->Global SIP->Advanced SIP Settings.
5. In the “As-Feature-Event Subscription Period” field, enter the amount of time, in seconds, that the phone waits after sending a SUBSCRIBE,
to receive a NOTIFY response from the server side. Default is 3600.
6. Click Save Settings to save your changes.
Aastra Web UI
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