Yealink T48G, Administrator'S Manual

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Account Settings
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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
RFC 3263 . 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 SIP server name resolution.
Parameter account.X.sip_server.Y.transport_type [1][2][3] <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 IP phone performs the DNS NAPTR and
SRV queries for the service 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 IP 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 sip.dns_transport_type <y0000000000xx>.cfg
Description It configures the transport protocol the IP phone uses to perform a DNS query.
Permitted 0-UDP