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3.11 System Restrictions

Note the following system restrictions regarding call control functions: The protocol-independent call control functions can only be used when a line protocol (not including NOCC) is executing on the port. Operations that use DSP resources are only available when the line is in the connected state. There are exceptions to this rule, which are protocol- specific and are explicitly noted. For example, some protocols allow the application to generate a tone and play messages in the Rejecting Call state.

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