AASTRA 53i Nota De Lançamento

106

RN-001029-00, Rev 03, Release 2.1 

IP Phone Release Notes 2.1

In this release of the Aastra IP phones, the “Hold” feature has been enhanced as 
described in RFC3264. The Hold feature allows IP phone users to put an active 
call on “hold,” then retrieve the call later. This enhancement is intended for Aastra 
IP phones operating with servers that support RFC3264 (for example, Broadsoft). 
If a server does not support RFC3264, then the IP phones do not use RFC3264 
functionality.

For information about this feature, see 

 on 

This release of the Aastra IP phones supports the SIP UPDATE message, as 
specified in RFC3311.

The server blacklist 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, but 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. The default setting is 300 seconds. If you set the duration to 0 
seconds, then you disable the blacklist feature.