Configuring Your System for ITSP Interoperability
Configuring SIP Timer Values
Cisco Small Business WRP400 Administration Guide
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2
•
RTP ports—16384 to 16482
•
Also disable SPI (Stateful Packet Inspection) if this function exists on your
firewall.
Configuring SIP Timer Values
The default timer values should be adequate in most circumstances. However, you
can adjust the SIP timer values as needed to ensure interoperability with your
ISTP. For example, if SIP requests are returned with an “invalid certificate”
message, you may need to enter a longer SIP T1 retry value.
For more information, see
”SIP Timer Values (sec) section,” on page 65 of
Appendix A
.