By default, all IP extensions and lines are configured to automatically match the top-level system settings for SRTP, whether disabled or enabled. This simplifies enabling SRTP by ensuring that all devices are using the same SRTP settings. Using this approach, once SRTP is enabled, the only device level configuration required is to disable SRTP on those lines or devices for which it is not required.

The exception to the above is SIP lines for which SRTP is disabled by default. This is due to the low number of SIP line providers who currently support SRTP. However, SIP lines can be configured to also match the system level settings if required.