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...working in the VoIP industry for just a bit over a year now... Mostly taking care of the underlying systems. I've now reached the point where I'm being drawn more and more into the call processing side of things. My background is in computer and "classic" telephony systems (DMS250/MTX, DSC 400, T1, channel banks. telabs analog echo supressor modules and analog mux etc). I've seen one commercial product recently based on openh323proxy called a transit softswitch and now I'm looking at asterisk. Is there a difference between what asterisk is and a softswitch? Can...

Hi all, I have seen the term E1 and PRI used interchangably when referring to a voice service with 30B channels and 1 D channel. Are they just different terms for the same thing or is there some technical difference. Even Newton's telco dictonary seemed a bit fuzzy on this topic. I have seen it said the PRi is a protocol that runs on top of E1. Is this true?

We are having line noise issues in our Asterisk to legacy PBX integration. All SIP calls originating from IP phones sound crystal clear. All calls that originate from the legacy PBX (Isoetec 228) and route through the Asterisk and out SIP have a lot of line noise. I believe I have it pinned down to these Blue Alarm errors that I can see on the legacy PBX side. zttool shows no alarm but when I

...Digium FXO Interfaces don't support > > groundstart??? > > > > > > > First of all I use this in humor: > > > > > > Frank you ignorant slut! > > > > > > > > > I have to disagree on your analysis. I worked in telephone COs (DMS250, > > > Stromberg/Carlson) and with PBXes for over a decade. Glare can and is > > > controlled by ground start signaling. It does so because the ground is > > > tested for (or supposed to be) prior to dialing. It's called the > > > pre-seize condition. On...

I came into this with my eyes wide open. I have read ABSOLUTELY EVERYTHING there is to be found on the net about avoiding echo problems BEFORE I even attempted to create a production system. Since lots of people are apparently using this in production environments now I just assumed that echo IS avoidable. As others have recommended, I created a test system with the proposed production