Account Settings
47
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
template.X.sip_server.Y.transport_type
[1][2]
<y0000000000xx>.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
Web UI
Handset & Account > SIP Server Settings > Edit > SIP Server Y
[2]
> Transport
Parameter
account.X.naptr_build
[4]
<MAC>.cfg
Description
It configures the way of SRV query for the phone to be performed when no result is returned from the
NAPTR query.
Permitted
Values
0
-SRV query using UDP only
1
-SRV query using UDP, TCP, and TLS.
Default
0
Parameter
sip.dns_transport_type
<y0000000000xx>.cfg
Description
It configures the transport protocol the phone uses to perform a DNS query.
Permitted
Values
0
-UDP
1
-TCP
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
Integer from 0 to 65535
Default
3
Parameter
static.network.dns.retry_times
[3]
<y0000000000xx>.cfg