3Com VCX v7111 User Manual page 78

Parameter
DNS Query Type
[DNSQueryType]
Enable SRV Queries
[EnableSRVQuery]
78
Description
Enables the use of DNS Naming Authority Pointer (NAPTR) and Service
Record (SRV) queries to resolve Proxy and Registrar servers and to
resolve all domain names that appear in the Contact and Record-Route
headers. Valid options include:
[0] = A-Record (default)
[1] = SRV
[2] = NAPTR
If set to A-Record, no NAPTR or SRV queries are performed.
If set to SRV and the Proxy / Registrar IP address parameter or the
domain name in the Contact / Record-Route headers contains a domain
name without port definition, an SRV query is performed. The gateway
uses the first host name received from the SRV query. The gateway then
performs DNS A-record query for the host name to locate an IP address.
If set to NAPTR, an NAPTR query is performed. If it is successful, an SRV
query is sent according to the information received in the NAPTR
response. If the NAPTR query fails, an SRV query is performed according
to the configured transport type.
If the Proxy / Registrar IP address parameter or the domain name in the
Contact / Record-Route headers contains a domain name with port
definition, the gateway performs a regular DNS A-record query.
To enable NAPTR/SRV queries only for Proxy servers, use the
parameter ProxyDNSQueryType.
This parameter is obsolete. Please use the parameter DNSQueryType.
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VCX V7111 VoIP Gateway User Guide