Mitel 6867i Administrator's Manual page 219

Configuring a Backup Outbound Proxy
To configure this feature an Administrator can set the following parameters in the configuration
files or the Mitel Web UI:
PARAMETER
sip outbound support
sip symmetric udp signaling
sip transport protocol
GLOBAL PARAMETERS
sip backup outbound proxy
sip backup outbound proxy port
PER-LINE PARAMETERS
sip lineN backup outbound proxy
sip lineN backup outbound proxy port
Note: The "sip outbound support", "sip symmetric udp signaling", and "sip transport
protocol" parameters are existing parameters on the phone. For more information about
these parameters, see Appendix A
Setting", and "Advanced SIP
Use the following procedure to configure backup outbound proxies.
CONFIGURATION FILES
For the specific parameter you can set in the configuration files, see Appendix A, the section,
"Backup Outbound Proxy (Global Settings)"
on .
Settings)" page A-89
Limitations
The following are limitations with this feature:
• Keep-alive mechanisms shall be limited to IPv4 only.
• Per M5T, RFC5686 is not fully supported although the draft upon which it was based
(draft-ietf-sip-outbound-15) is supported.
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.
MITEL WEB UI
CONFIGURATION
-
-
4
4
4
4
4
"SIP Outbound Support",
Settings".
on and
page A-78 "Backup Outbound Proxy (Per-line
Global SIP Settings
CONFIGURATION FILE
CONFIGURATION
4
4
4
4
4
4
4
"Symmetric UDP Signaling
4-66