asterisk users - Oct 2012 - DAHDI help please

Can anyone tell me if it is possible to invert the signaling bits on a T1
channel?
I need to emulate PLAR signaling in asterisk.  E&M seems to be an exact
match if reversed.
I need idle bits 1111 and seized 0000
Thank you

On Mon, Oct 01, 2012 at 06:44:22PM -0400, Pat Collins
wrote:
> Can anyone tell me if it is possible to invert the signaling bits
> on a T1 channel?
>
> I need to emulate PLAR signaling in asterisk.  E&M seems to be an
> exact match if reversed.
>
> I need idle bits 1111 and seized 0000
Perhaps you could edit dahdi_rbs_sethook() and dahdi_q_sig()?  Those
function map state to RBS states.

-- 
Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: www.digium.com & www.asterisk.org

Thank you!
So, this code in dahdi-base.c should work?

void dahdi_rbsbits(struct dahdi_chan *chan, int cursig)
{
	unsigned long flags;
	if (cursig == chan->rxsig)
		return;
	if ((chan->flags & DAHDI_FLAG_SIGFREEZE)) return;
	spin_lock_irqsave(&chan->lock, flags);
	switch(chan->sig) {
	    case DAHDI_SIG_EM:
		if (!(cursig & DAHDI_XBIT)) {
		__dahdi_hooksig_pvt(chan, DAHDI_RXSIG_START);
			break;
		}
		/* Fall through */

Please forgive my ignorance.  
As long as folks like you are there to help, folks like me will not remain
ignorant for long!
Thank you again!

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Shaun Ruffell
Sent: Wednesday, October 03, 2012 1:40 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] DAHDI help please

On Tue, Oct 02, 2012 at 11:22:31PM -0400, Pat Collins
wrote:
> Shaun,
> To make more sense of the code, I changed 
> #define DAHDI_XBIT		(3 >> 2) to 
> #define DAHDI_XBIT		(0)
> 
> Sadly, incoming calls do not work.  Not sure exactly how to START or 
> RING when the RX AB bits are 00 Any ideas?
> Thanks again for your help!
The board drivers call dahdi_rbsbits() when they want to report a change in
the state of the RBS bits for a channel. If you look in the code there you
will see where events are generated depending on the signalling type.

I should have pointed out that function in my previous email.

Cheers,
Shaun

--
Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA Check us out at:
www.digium.com & www.asterisk.org

--
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