Hi Andrew, Thanks for responding. Yes, I noticed that some code *seems* to support this.
I started with a Voicetronix Openswitch12, which has, even in its driver code, no support for anything resembling kewlstart. After figuring out that the MICS seemed to respond to opening the circuit for a short time, I tried to program a "flash" into asterisk (and then tried to write simpler code to interface with their driver) and found that doing anything with flash or "on/off hook" status while the card was in FXS mode made the port totally unstable. I've been dealing with someone at Voicetronix and, after the usual "WHY would you use FXS to interface with a PBX?!," he seemed helpful...until I told him that I figured that there was absolutely nothing that I could imagine, software-based, that I could do to get around it. After my boss caught wind of it, he's now trying to control the situation a bit. We ordered a Digium card AND now he wants to create a circuit with as many relays as we have lines and trigger that using signals from the parallel port. I'm extremely hesitant to go that route for obvious reasons. I'm hoping the Digium card works, but if it doesn't, I'm stuck either returning a lot of hardware or going to get solder burns. -Dave -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andrew Kohlsmith Sent: Monday, October 31, 2005 8:51 AM To: [email protected] Subject: Re: [Asterisk-Users] FXS Disconnect Supervision (Kewlstart / OpenLoop Disconnect) On Monday 31 October 2005 08:37, David Stude wrote: > The upshot of this is that I'm trying to connect a Norstar MICS > system, which has FXO analog ports, to our new Asterisk system, using FXS ports. > The Norstar only recognizes disconnect supervision and, otherwise, > will not free up the line unless explicitly told to do so, so it's > necessary for me to provide that signal from a FXS port on a card > that's ready for use in Asterisk. I've already used one card and, at > least until now, have not had any success. I interfaced our Norstar MICS trunk lines to a cheap-ass Carrier Access Access Bank I with FXS ports and I *never* had any issues with the MICS not dropping the trunk line when the call was completed. I now use a DTI+PRI keycode and do the Asterisk<-->Norstar connection with a PRI but it worked fine in the original case. Basically if you tell Asterisk to use KewlStart signalling on the line it will send the CPD bit pattern on to the line, but if the channel bank/remote equipment doesn't know what to do with it, nothing will happen. This is the case with the AB1 and AB2. The Carrier Access Adit600 knows how to sense and send CPD so it's not an issue there, and the TDM FXS modules I believe do handle the CPD state properly. Actually I just checked the wctdm driver and it does seem to support polarity reversal when instructed from Asterisk, which is what would happen when KewlStart signaling is selected. (wctdm.c, wctdm_ioctl() function, ZT_SETPOLARITY case if you're curious.) Have you actually tried this, or are you raising potential concerns? -A. _______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
