Yealink T5 Series, Administrator'S Manual

Page: 179 / 472

Account Settings
173
Topic
SIP Server Name Resolution Configuration
SIP Server Name Resolution Configuration
The following table lists the parameters you can use to configure 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 phone performs the DNS NAPTR and SRV queries for the ser-
vice type and port.
Default 0
Web UI Account->Register->SIP Server Y->Transport
Parameter
account.X.naptr_build
[1]
<MAC>.cfg
Description
It configures the way of SRV query for the phone to be performed when no result is returned from NAPTR
query.
Permitted
Values
0 -SRV query using UDP only
1 -SRV query using UDP, TCP and TLS.
Default 0
Parameter
static.network.dns.query_timeout
[3]
<y0000000000xx>.cfg
Description
It configures the interval (in seconds) at which the phone retries to resolve a domain name when the DNS
server does not respond.
Permitted
Values
0 to 65535
Default 3
[1]
X is the account ID. For T58V/T58A/T56A, X=1-16; for CP960, X=1.
[2]
Y is the server ID. Y=1-2.
Static DNS Cache
Failover redundancy can only be utilized when the configured domain name of the server is resolved to multiple IP
addresses. If the IP phone is not configured with a DNS server, or the DNS query returns no result from a DNS server,
you can statically configure a set of DNS NAPTR/SRV/A records into the IP phone. The phone will attempt to resolve
the domain name of the SIP server with static DNS cache.
Support for negative caching of DNS queries as described in RFC 2308 is also provided to allow faster failover when
prior DNS queries have returned no results from the DNS server.
Topics
Behave with a Configured DNS Server