[asterisk-users] Zap difficulties

[Rusty Dekema]

It's normal to have to wait (under a second in your case) for a dial
tone from the phone company when seizing a line.

If you were placing a call on a phone directly connected to the phone
company, the time it takes to physically pick up the phone and move
your hand to the dial normally takes at least a half a second, giving
the CO time to start the dial tone and prepare to receive the dialed
digits.

In the old days, one actually had to listen for the dial-tone before
dialing, as the phone company equipment would not necessarily be ready
to receive your digits in 1-2 seconds. With modern electronic
switches, though, a constant delay of 0.5s - 1.0s should be fine.

-Rusty



On 8/15/06, Curt Shaffer <cshaffer at gmail.com> wrote:
> That did help. But can you help me understand why this is needed? I did not
> notice any of the other issues you mentioned but I do notice that it takes
> an unusually long time to hang up the channel when it is done with the call.
> It almost seems like the signaling is not right. I was discussing this issue
> with someone offline and from what I understand, the POTS lines are on
> loopstart. If that is true why do we use koolstart on the zaptel channel?
> Just as an experiment I did change the signaling to loopstart but that did
> not help either. The biggest issue is that I am in an area where just about
> all of the business are using POTS lines exclusively, and adding a pause to
> all of these just seems like a hack to me rather than fixing an issue. I'm
> not saying this is not my misunderstanding, because it may well be, but I am
> just looking for the exact answer.
>
> Thanks
>
> Curt
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Eric
> "ManxPower" Wieling
> Sent: Tuesday, August 15, 2006 12:36 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Zap difficulties
>
> Curt Shaffer wrote:
> > I am having a weird issue with my zap channel (Digium TDM01B). Randomly it
> > appears that the POTS line is not seeing all of the digits passed. We have
> > to dial a 1 and the area code to call most numbers here, and we get the
> > error that we need to dial a 1 and the area code when dialing this number
> > even though we are dialing it. Also when I dial 8xx numbers it never works
> > (same error). I do have all of those set up as allowed and routing
> properly
> > from the dial plan and I can test that by switching to a VoIP termination
> > and the calls go through without a hitch. I can also dial these numbers
> fine
> > if I hook a POTS phone directly to the cable that connects to the Digium
> > card. Asterisk looks as if it is passing the digits,
> > (ZAP/g0/18003569377|120|r) for example.
>
> Dial(ZAP/g0/w18003569377|120)
>
> This will put a .5 second wait before dialing to allow the telco
> equipment to get ready to receive DTMF.
>
> Have you noticed other issues like, even when calling busy numbers, you
> hear a ringing tone for about 5.5 seconds before you hear a busy tone?
> That's because you are using the "r" option to Dial.
>
>
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