Mitel 6867i Premium, Administrator'S Manual, Page: 70 / 1042

Mitel 6800 Series SIP Phone Release 4.2.0 Administrator Guide
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<mac>.cfg
sip proxy port: 5064 //this parameter is unlocked
sip registrar port: 5064//this parameter is unlocked
With this configuration, on the Web UI, the "
sip proxy ip
" and "
sip registrar ip
” parameters
cannot be modified (they are grayed out), and the value is "pbx.mitel.com" since
<model>.cfg
has overwritten
startup.cfg
.
The "
sip proxy port
" and "
sip registrar port
" parameters can be modified through Web UI
because
<mac>.cfg
has overwritten
<model>.cfg
and
startup.cfg
. On the Web UI, the value
for these parameters is 5064.
CONFIGURATION SERVER REDUNDANCY VIA DNS A RECORDS
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.
The phones also 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, etc.
This feature supports all the download protocols (TFTP, FTP, HTTP, and HTTPS).
Limitation
In certain cases, the TFTP Protocol cannot distinguish between “server down” and “no file on
server” error messages; therefore, the failover in these instances may fail.
Notes:
1.
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.).
2.
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.
3.
The “
Skip
” softkey displays in the event of a network outage, the user can skip the
configuration download and continue the boot.
4.
All server failovers and failed server IP addresses are logged in the “Error Messages”
page on the IP Phone UI at
Options->Phone Status->Error Messages
.