Administrator’s Guide for VP59/SIP-T58A/CP960 IP Phones
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proxy server after failing over to the current working server.
If you set the parameter to 0, the phone will not send requests to the primary outbound proxy server
until a failover event occurs with the current working server.
Note: It works only if “account.X.outbound_proxy.Y.failback_mode” is set to 3 (duration).
Permitted
Values
0, Integer from 60 to 65535
Default
-1, the phone will invoke “account.X.sip_server.Y.failback_timeout” to take effect.
Parameter account.X.outbound_proxy.Y.failback_subscribe.enable
[1][2]
<MAC>.cfg
Description
It enables or disables the phone to retry to re-subscribe after registering to the secondary outbound
proxy server with different IP addresses when encountering a failover.
Note: It works only if “account.X.outbound_proxy.Y.failback_mode” is set to 1, 2 or 3.
Permitted
Values
0-Disabled
1-Enabled, the phone will immediately re-subscribe to the secondary outbound proxy server, for ensur-
ing the normal use of the features associated with a subscription (for example, BLF, SCA).
Default
-1, the phone will invoke “account.X.sip_server.Y.failback_subscribe.enable” to take effect.
[1]
X is the account ID. For VP59/T58A, X=1-16; for CP960, X=1.
[2]
Y is the server ID. Y=1-2.
SIP Server Name Resolution
If a domain name is configured for a server, the IP address(es) associated with that domain name will be resolved
through DNS as specified by
. The DNS query involves NAPTR, SRV and A queries, which allows the IP
phone to adapt to various deployment environments. The IP phone performs NAPTR query for the NAPTR pointer
and transport protocol (UDP, TCP, and TLS), the SRV query on the record returned from the NAPTR for the target
domain name and the port number, and the A query for the IP addresses.
If an explicit port (except 0) is specified, A query will be performed only. If a server port is set to 0 and the transport
type is set to DNS NAPTR, NAPTR and SRV queries will be tried before falling to A query. If no port is found through
the DNS query, 5060 will be used.
Topic
SIP Server Name Resolution Configuration
SIP Server Name Resolution Configuration
The following table lists the parameters you can use to configure the SIP server name resolution.
Parameter account.X.sip_server.Y.transport_type
[1][2]
<MAC>.cfg
Description It configures the type of transport protocol.
Permitted
Values
0-UDP
1-TCP
2-TLS
3-DNS NAPTR, if no server port is given, the device performs the DNS NAPTR and SRV queries for
the service type and port.
Default
0
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