Configuration Server Redundancy Via Dns A Records - Aastra 9143i Series Release Notes

For 3-Line Phones:
1. Press on the phone to enter the Options List.
2. Select Preferences.
3. Select Time and Date.
4. Select Time Zone.
5. In the Country Code field, enter "DP";
or
Press "*" and select Dhcp from the time zone list.
6. Press Enter to save the change. The change is dynamic and occurs immedi-
ately.

Configuration Server Redundancy via DNS A Records

Currently the phone sends a DNS query and in the DNS response, it accepts the first
server IP address and contacts that server, ignoring any additional IP addresses in the
response. This allows service providers to manage load balancing (via the DNS server
putting different records first on each request), but does not provide redundancy.
In Release 2.6, the phones now provide support of multiple IP addresses being
returned for the DNS lookup for server redundancy via multiple DNS A record entries.
The phone tries to contact the first server address it receives, but if this fails, it now
tries to contact the second server address, etch.
This feature supports all the download protocols (TFTP, FTP, HTTP, and HTTPS).
Notes:
• Once the phone has failed over to a redundant server, it continues to use that
server for all other server-related processes on the phone (i.e., firmware upgrades
from the Web UI, boot-up process, etc.).
• If a server fails while downloading a file(s) to the phone, the phone performs the
discovery process of finding a redundant server that is available. When the boot is
complete on the redundant server, the phone tries to download the file(s) again
from the previous server. The check-sync process also performs the same way
when a server fails.
• The "Skip" softkey displays in the event of a network outage, the user can skip the
configuration download and continue the boot.
• All server failovers and failed server IP addresses are logged in the "Error Mes-
sages" page on the IP Phone UI at Options->Phone Status->Error Messages.
RN-001029-05 REV 00 – 04.2010
New features in release 2.6
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