Administrator’s Guide for VP59/SIP-T58A/CP960 IP Phones
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If TCP is used, then the signaling fails if the connection or the send fails.
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If UDP is used, then the signaling fails if ICMP is detected or if the signal times out. If the signaling has been
attempted through all servers in the list (this list contains all the server addresses resolved by the DNS
server) and this is the last server, then the signaling fails after the complete UDP timeout defined in
. If it is not the last server in the list, the maximum number of retries depends on the configured retry
counts (configured by the parameter “account.X.sip_server.Y.retry_counts”).
Registration Method of the Failover/Fallback Mode
Registration method of the failover mode:
The IP phone must always register to the primary server first except in failover conditions. If this is unsuccessful, the
phone will re-register as many times as configured until the registration is successful. When the primary server regis-
tration is unavailable, the secondary server will serve as the working server. As soon as the primary server regis-
tration succeeds, it returns to be the working server.
Registration methods of the fallback mode include (not applicable to outbound proxy servers):
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Concurrent registration (default): The IP phone registers to SIP server 1 and SIP server 2 (working server and
fallback server) at the same time. Note that although the IP phone registers to two SIP servers, only one server
works at the same time. If it fails, a fallback server can take over the basic calling capability, but without some
advanced features (for example, shared lines and MWI) offered by the working server.
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Successive registration: The IP phone only registers to one server at a time. The IP phone first registers to the
working server. In a failure situation, the phone registers to the fallback server, and the fallback server can take
over all calling capabilities.
Fallback Server Redundancy Configuration
The following table lists the parameters you can use to configure fallback server redundancy.
Parameter account.X.fallback.redundancy_type
[1]
<MAC>.cfg
Description
It configures the registration mode in fallback mode.
Note: It is not applicable to outbound proxy servers.
Permitted
Values
0-Concurrent registration
1-Successive registration
Default
0
Parameter account.X.fallback.timeout
[1]
<MAC>.cfg
Description
It configures the time interval (in seconds) for the phone to detect whether the working server is avail-
able by sending the registration request after the fallback server takes over call control.
Note: It is not applicable to outbound proxy servers.
Permitted
Values
Integer from 10 to 2147483647
Default
120
Parameter account.X.outbound_proxy_fallback_interval
[1]
<MAC>.cfg
Description
It configures the time interval (in seconds) for the phone to detect whether the working outbound proxy
server is available by sending the registration request after the fallback server takes over call control.
Note: It is only applicable to outbound proxy servers.
Permitted
Values
Integer from 0 to 65535
Default
3600
Содержание One Talk CP960
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