400HD Series IP Phones
Administrator's Manual
66
Document #: LTRT-11973
5.1.2.2
Device Registration Failover/Failback
5.1.2.2.1
Failover
This feature enables a secondary server to take over the functions of the primary server on
the enterprise network, if SIP communication between the SIP access device and the primary
proxy server is blocked or delayed or the primary server isn't available.
No phone functionality is lost when the secondary server takes over.
Note:
•
For failover to function, the Proxy DNS server must be configured with a list of the
names of the proxies, in order and priority, i.e, SRV record. Before the phone tries to
register, it performs an NAPTR / SRV query (see the table below for an explanation
of these). The DNS server send a prioritized list. The phone sends a Registration
request to the first SIP server; if it isn’t responsive in
n
time retries (i.e.,
'outgoing_request_no_response_timeout' parameter), it goes to the second, etc.,
until it gets a response.
•
SIP Proxy/Outbound Proxy must be configured as the host name.
To configure failover:
•
Use the table as reference.
Table 5-4: Device Registration Failover Parameters
Parameter
Description
voip/signalling/sip/transport_protocol
Either:
UDP (default)
TCP
TLS encryption
In the SIP protocol, Name Authority Pointers (NAPTRs)
are used to map servers and user addresses.
Combined with Service Records (SRVs), they enable
determining the service types available for a name, the
name to use for an SRV lookup, and the port and 'A'
DNS records to use to find the IP for the service.
voip/signalling/sip/outgoing_request_no
_response_timeout_ms
This is the timeout, in milliseconds, that lapses until the
phone failovers to the secondary proxy. Default: 32000
voip/signalling/sip/sip_outbound_proxy/
addr
Configure this parameter as an SRV host name.
voip/signalling/sip/sip_outbound_proxy/
port
Configure a value of
65535
for this parameter.
Configure
the parameter when you're using an Outbound Proxy.
Either configure
this
parameter
or
the parameter 'Proxy
Port'.
voip/signalling/sip/proxy_address
Configure this parameter as an SRV host name.
voip/signalling/sip/proxy_port
Configure a value of
65535
for this parameter.
Configure
the parameter when you're using a regular Proxy
server.
Either configure
this
parameter
or
the parameter
'Outbound Proxy Port'.
Summary of Contents for 405HD
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