> -----Original Message----- > From: John Lange [mailto:[EMAIL PROTECTED] > Sent: July 26, 2006 6:12 PM > To: [email protected] > Subject: Re: [on-asterisk] How do others do this? > > On Wed, 2006-07-26 at 16:23 -0300, > [EMAIL PROTECTED] wrote: > > Perhaps some of you are not aware of how the old DID lines > work. When > > the incoming call is transferred to one of these trunks, 48 > volts must > > be present. The CO switch seizes the line and polarity is > reversed by > > the PBX to indicate ability to receive the call. This is > called wink > > start. Four digits from the bank of DID numbers are then > transferred > > and the call is connected. It is a standard ability of a real PBX > > since it has been traditionally assumed that DID trunking can be > > handled by a PBX. In fact, a lot of the new IP PBXs out > there do this > > form of DID, also known as DID-over-analog. A few of these > lines are > > much cheaper to run than a T1. That's why I'm disappointed > that there doesn't seem to be any direct support for DID > cards on Asterisk. We have two sets of these trunk lines to > support but it needs to function for the messaging service to start. > > According to > http://www.voip-info.org/wiki/index.php?page=Asterisk+config+z apata.conf > > Asterisk supports the following signalling types: > * em: E & M Immediate Start > * em_w: E & M Wink Start > ... > > The description you gave above seems to be E & M Wink start. > > I hadn't been aware of this type of signaling until you > brought this up. > Is it commonly available in Canada?
That is a signalling protocol for tie lines, and in Asterisk that is only supported on CAS T1 circuits. An analogue tie line is not likely to happen for asterisk, as they use either 6 or 8 wires, so that'll be a strictly T1 signalling method. Jim. -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.10.4/399 - Release Date: 25/07/2006
