How to shutdown span via CLI or API?

Please explain me:
How to shutdown span via CLI or API?

I found only the one command:
CLI> pri destroy span 1
but it not suitable for me, because I don’t want to destroy span, but only shutdown specified span.
e.g.:
CLI> pri show spans
PRI span 1/0: Up, Active
PRI span 2/0: Up, Active
CLI> pri destroy span 1
PRI span 2/0: Up, Active

The required state is:
PRI span 1/0: Down, Active

Keep in mind, that the this call is forbidden:

     ioctl(fd, DAHDI_SHUTDOWN, &span); 

because after that, the call:

     ioctl(fd, DAHDI_STARTUP, &span); 

return unconfigured span.