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Unify OpenScape Desk Phone IP V3R3 - Phone Administration SIP Manual

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A31003-D3000-M100-02-76A9, 11-2013
OpenScape Desk Phone IP V3R3, Phone Administration, Administrator Documentation 113
Administration
System Settings
• As SIP gateway address, enter the DNS domain name for which the DNS
SRV records are valid. The web interface path is System > Registration >
SIP gateway address.
If the SIP server is to be configured by DNS SRV, set the mentioned
parameter to the DNS domain name for which the DNS SRV records are
valid. The SIP server address is specified in System > Registration > SIP
server address. For details, see SIP Addresses.
A survivability proxy acts as a relay between the phone and the primary SIP
server. Thus, the address of the survivability proxy is specified as gateway or
SIP server at the phone (see SIP Registration). When the TLS connection
between the survivability proxy and the SIP server breaks down, e. g.
because of server failure, the survivable proxy itself acts as a replacement for
the primary SIP server. Vice versa, in case the phone can not reach the
survivability proxy itself, it will register directly with the primary SIP server,
provided that it is specified in the DNS SRV server list.
The survivability proxy notifies the phone whenever the survivability changes,
so it can indicate possible feature limitations to the user. Furthermore, to
enhance survivability, the phone will be kept up-to-date about the current
survivability state even after a restart.
Another way to realize survivability is the use of multiple, geographically
separated SIP servers. Normally, the phone is registered with that server that
has the highest priority in the DNS SRV server list. If the highest priority server
fails to respond to the TLS connectivity check (see Connectivity Check), the
phone will register with the server that has the second highest priority.
2. Use of a Backup SIP Server. Along with the registration at the primary SIP
server, the phone is registered with a backup SIP server. In normal operation,
the phone uses the primary server for outgoing calls. If the phone detects that
the connection to the primary SIP server is lost, it uses the backup server for
outgoing calls. This connection check is realized by 2 timers; for details, see
Response Timer and Non-INVITE Transaction Timer. For configuring the
backup server, please refer to Backup SIP Server.
INFO: In survivability mode, some features will presumably not
be available. The user will be informed by a message in the Call
View display.
Related To pics
Related Topics
•
System Settings
• Connectivity Check
• Response Timer
• Non-INVITE Transaction Timer
• Maximum Registration Backoff Timer
• Backup SIP Server
… 113 …


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