Global SIP Settings
41-001160-04 Rev 02, Release 2.5
4-75
Configuring Network and Session Initiation Protocol (SIP) Features
Enablling/Disabling SIP Outbound Draft 15 Support
.
Use the following procedure to enable/disable SIP outbound Draft 15 support.
Limitations
The following are limitations to this feature:
•
SIP outbound on the phones is only supported for TLS and TCP based
messages. UDP is not supported.
•
The “keep-alive” only works with REGISTER connections.
SIP Server (SRV) Lookup
The SIP SRV Lookup feature allows you to configure the IP phone to perform a
DNS server lookup on a SIP proxy, a SIP registrar, or a SIP outbound proxy.
The IP phone performs an SRV lookup 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 performs 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
Configuration Files
For the specific parameter you can set in the configuration files, see Appendix A, the section,
“SIP Outbound
Support”
on
page A-76.
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