41-001343-01 Rev 02, Release 3.2.2
4-73
SIP Server (SRV) Lookup
The SIP SRV Lookup feature allows you to configure the IP phone to issue a DNS query to
retrieve records pertaining to a SIP proxy, a SIP registrar, or a SIP outbound proxy.
The IP phone issues a DNS query for an SRV record when the IP address of the server is FQDN
and the corresponding port is 0.
For example, if the phone is configured with
sip proxy ip of "ana.aastra.com"
, and
sip proxy
port of "0"
, the SRV lookup may return multiple servers, based on the priorities if one is selected
as primary and others are selected as secondary. However, if the IP address is an FQDN and the
corresponding server port is non-zero, then the phone issues a DNS "A" Name Query to resolve
the FQDN into dot notation form.
If the IP address is a valid dot notation and the port is zero, then a default port 5060 is used.
You can configure SRV lookup using the configuration files (
aastra.cfg
and
<mac>.cfg
) only. The
parameters to use are:
•
sip proxy ip
•
sip proxy port
Note:
The phones only generate a ‘request’ and do
not
facilitate the
‘DNS or SRV service or provide a response to the requests.
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