diff zaptel-1.0.7/wcfxs.c zaptel-1.0.7.new/wcfxs.c
1603a1604,1619
> 	case ZT_SETPOLARITY:
> 		if (wc->modtype[chan->chanpos - 1] != MOD_TYPE_FXS)
> 			return -EINVAL;
> 		if (get_user(x, (int *)data))
> 			return -EFAULT;
> 		/* Can't change polarity while ringing or when open */
> 		if ((wc->mod.fxs.lasttxhook[chan->chanpos -1 ] == 0x04) ||
> 		    (wc->mod.fxs.lasttxhook[chan->chanpos -1 ] == 0x00))
> 			return -EINVAL;
> 
> 		if (x)
> 			wc->mod.fxs.lasttxhook[chan->chanpos - 1] |= 0x04;
> 		else
> 			wc->mod.fxs.lasttxhook[chan->chanpos - 1] &= ~0x04;
> 		wctdm_setreg(wc, chan->chanpos - 1, 64, wc->mod.fxs.lasttxhook[chan->chanpos - 1]);
> 		break;