Mitel 6800 Series, Administrator'S Manual, Page: 639 / 1113

Advanced Operational Features
6-50
CONFIGURABLE DNS MAXIMUM CACHE TTL
Administrators can manually set the DNS maximum cache TTL settings for both negative and
positive responses on the phone by defining the “
sip dns cache negative max ttl
” and “
sip
dns cache positive max ttl
” parameters in the configuration files. Setting these parameters
will help alleviate issues regarding the phone not considering the DNS retry time settings defined
by the DNS server.
CONFIGURING THE DNS MAXIMUM CACHE TTL
Use the following procedure to configure the DNS maximum cache TTL settings.
For the specific parameter you can set in the configuration files, see Appendix A, the section,
“DNS Maximum Cache TTL Settings” on
page A-299
.
CONFIGURABLE TRANSPORT PROTOCOL FOR SIP SERVICES AND
RTCP SUMMARY REPORTS
Parameters have been implemented allowing administrators the ability to independently
configure the transport protocols used by SIP services (e.g. the SIP XML Notify service) and
RTCP summary reports. The following parameters are available to be defined in the
configuration files:
SIP SERVICES
• sip services transport protocol
• sip services port
The above parameters are used to specify the transport protocol and port used for SIP services.
RTCP SUMMARY REPORTS
• sip rtcp summary reports transport protocol
The above parameter is used to specify the transport protocol used for RTCP summary reports.
CONFIGURATION FILES
Notes:
1.
The parameter "sip symmetric udp signaling" is effective when the transport protocol
for RTCP summary reports is set to be UDP. For more information on symmetric
udp signaling, refer to
"Symmetric UDP Signaling‚" on page 30 .
2.
When the SIP transport protocol is set to TCP and the RTCP summary reports
transport protocol is set to UDP, if an outbound proxy is configured, all SIP requests
including RTCP summary reports will be sent over TCP.
3.
In cases where the SIP services transport protocol is the same as the SIP transport
protocol or RTCP summary reports transport protocol, only the SIP services port is
enabled (the phone listens on the SIP services port as well as the local SIP port if
they are different [if they are the same, no extra action is needed]).