primary Proxy server.
 When a port number is specified, DNS NAPTR/SRV queries
aren't performed, even if the parameter DNSQueryType is
set to 1 or 2.
 If the parameter RegistrarIP is set to an FQDN and is
resolved to multiple addresses, the device also provides
real-time switching (hotswap mode) between different
Registrar IP addresses (the parameter IsProxyHotSwap is
set to 1). If the first Registrar doesn't respond to the
REGISTER message, the same REGISTER message is
sent immediately to the next Proxy. To allow this
mechanism, the parameter EnableProxyKeepAlive must be
set to 0.
 When a specific transport type is defined using the
parameter RegistrarTransportType, a DNS NAPTR query is
not performed even if the parameter DNSQueryType is set
to 2.
Web/EMS: Registrar Transport
Type
[RegistrarTransportType]
Determines the transport layer used for outgoing SIP dialogs
initiated by the device to the Registrar.
 [-1] Not Configured (default)
 [0] UDP
 [1] TCP
 [2] TLS
Note: When set to ‘Not Configured’, the value of the parameter
SIPTransportType is used.
Web/EMS: Registration Time
[RegistrationTime]
Defines the time interval (in seconds) for registering to a Proxy
server. The value is used in the SIP Expires header. This
parameter also defines the time interval between Keep-Alive
messages when the parameter EnableProxyKeepAlive is set to
2 (REGISTER).
Typically, the device registers every 3,600 sec (i.e., one hour).
The device resumes registration according to the parameter
RegistrationTimeDivider.
The valid range is 10 to 2,000,000. The default value is 180.
Web: Re-registration Timing [%]
EMS: Time Divider
[RegistrationTimeDivider]
Defines the re-registration timing (in percentage). The timing is
a percentage of the re-register timing set by the Registrar
server.
The valid range is 50 to 100. The default value is 50.
For example: If this parameter is set to 70% and the
Registration Expires time is 3600, the device re-sends its
registration request after 3600 x 70% (i.e., 2520 sec).
Note: This parameter may be overridden if the parameter
RegistrationTimeThreshold is greater than 0.
Web/EMS: Registration Retry Time
[RegistrationRetryTime]
Defines the time interval (in seconds) after which a registration
request is re-sent if registration fails with a 4xx response or if
there is no response from the Proxy/Registrar server.
The default is 30 seconds. The range is 10 to 3600.
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