SIP User's Manual 374 Document #: LTRT-65415
MediaPack Series
Parameter Description
Standard mode [0].
When this parameter is set to [2] and the INVITE fails, the
device re-routes the call according to the Standard mode
[0]. If DNS resolution fails, the device attempts to route the
call to the Proxy. If routing to the Proxy also fails, the
Redirect/Transfer request is rejected.
When this parameter is set to [2], the XferPrefix parameter
can be used to define different routing rules for redirect
calls.
This parameter is disregarded if the parameter
AlwaysSendToProxy is set to 1.
Web/EMS: DNS Query Type
[DNSQueryType]
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 SIP Contact and Record-Route headers.
[0] A-Record (default)
[1] SRV
[2] NAPTR
If set to A-Record [0], no NAPTR or SRV queries are
performed.
If set to SRV [1] and the Proxy/Registrar IP address
parameter, Contact/Record-Route headers, or IP address
defined in the Routing tables contain a domain name, an SRV
query is performed. The device uses the first host name
received from the SRV query. The device then performs a DNS
A-record query for the host name to locate an IP address.
If set to NAPTR [2], 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, the domain name
in the Contact/Record-Route headers, or the IP address
defined in the Routing tables contain a domain name with port
definition, the device performs a regular DNS A-record query.
If a specific Transport Type is defined, a NAPTR query is not
performed.
Note: To enable NAPTR/SRV queries for Proxy servers only,
use the parameter ProxyDNSQueryType.
Web: Proxy DNS Query Type
[ProxyDNSQueryType]
Enables the use of DNS Naming Authority Pointer (NAPTR)
and Service Record (SRV) queries to discover Proxy servers.
[0] A-Record (default)
[1] SRV
[2] NAPTR
If set to A-Record [0], no NAPTR or SRV queries are
performed.
If set to SRV [1] and the Proxy IP address parameter contains
a domain name without port definition (e.g., ProxyIP =
domain.com), an SRV query is performed. The SRV query
returns up to four Proxy host names and their weights. The
device then performs DNS A-record queries for each Proxy
host name (according to the received weights) to locate up to
four Proxy IP addresses. Therefore, if the first SRV query
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