Hi Pekka,

> +	/*
> +	 * Release active, alerting, dialing, or incoming calls
> +	 * and answer the waiting call.
> +	 */

This actually only affects active calls.  On AT modems you cannot have
waiting calls when dialing / alerting.  Dialing / Alerting / Incoming
are also never affected by any CHLD commands.

I pushed my own patch with the updated documentation.  Let me know if I
missed something.

Regards,
-Denis