[VoIP] ProjectMF Changes

[Donald Froula]

Hi, Jayson,

I seem to recall this being an issue with blue box
users back when the ESS machines began replacing
electromechanical switches in end-offices. When
seizing a trunk with 2600, the handshake wink from the
far end would be interpreted as supervision, then a
hangup and the local office of the blue box user would
dump the call after 20 seconds or so.

I'll try calling the Wawina sup test through the SF
trunks and directly through IAX to see if there are
any differences in response.

Don

--- Jayson Smith <ratguy at bellsouth.net> wrote:

> Hi,
> I have a question about this. At least with IAX and
> Sip, whenever an
> off-hook followed by an on-hook happens, the
> connection seems to always be
> broken at that point. Try calling CNET +1 488-9103.
> This is the supervision
> test in the Wawina office. When the switch picks up,
> that is reported. And
> when it hangs up, the connection is broken, so you
> never get to see it
> picking up and hanging up any more after that. Is
> there some way to tell
> Asterisk not to treat an on-hook as the final
> goodbye? Otherwise, a wink
> from the called end would probably actually cause
> the call to end.
> Jayson.
> 
> ----- Original Message ----- 
> From: "Donald Froula" <dfroula at sbcglobal.net>
> To: "Voice Over IP Tandem for Analog Switches"
> <voip at ckts.info>
> Sent: Saturday, June 23, 2007 1:43 PM
> Subject: Re: [VoIP] ProjectMF Changes
> 
> 
> > I'm not sure on this. It is a real wink from the
> far
> > end of the SF trunk. I would imagine that Zaptel
> > reports it from the near end as a real wink back
> to
> > whatever line the call was placed from.
> >
> > Don
> >
> > --- Steph Kerman <stfkerman at jps.net> wrote:
> >
> > > In what case is this wink be detectable as an
> actual
> > > DC polarity
> > > reversal or E lead status change?
> > >
> > > Steph
> > >
> > > Donald Froula wrote:
> > > > I patched chan_zap.c in Asterisk to return a
> > > proper
> > > > wink when seizing.
> > > >
> > > > Don
> > > >
> > > > --- Donald Froula <dfroula at sbcglobal.net>
> wrote:
> > > >
> > > >
> > > >> I changed this to work in a slightly
> different
> > > way:
> > > >>
> > > >> You get 30 seconds of ringback. You can try
> to
> > > seize
> > > >> during this period. After 30 seconds, the
> trunk
> > > will
> > > >> seize automatically. A brief chirp of 2600
> from
> > > here
> > > >> allows MF dialing.
> > > >>
> > > >> This was added because of the difficulty
> seizing
> > > >> from
> > > >> the ringing line. Seizing the ringing line
> works
> > > >> well
> > > >> when coming in from CNET, but is harder when
> > > coming
> > > >> in
> > > >> from the PSTN - (630)485-2995.
> > > >>
> > > >> Don
> > > >>
> > > >> --- Donald Froula <dfroula at sbcglobal.net>
> wrote:
> > > >>
> > > >>
> > > >>> I've updated my ProjectMF dial plan to
> > > (hopefully)
> > > >>> provide more realistic seizures. The plan I
> was
> > > >>> using
> > > >>> did not return a wink on seizure, so was not
> > > very
> > > >>> realistic.
> > > >>>
> > > >>> When dialing in now, you get routed through
> an
> > > >>>
> > > >> SF/MF
> > > >>
> > > >>> trunk, to and endless ringback (with an
> > > occasional
> > > >>> voice prompt to play 2600). A successful
> seizure
> > > >>> should drop to the trunk and give 2600
> handshake
> > > >>> "kabeep".
> > > >>>
> > > >>> It is more difficult to seize the trunk,
> though,
> > > >>> requiring a longer and louder 2600.
> > > >>>
> > > >>> When a successful call hangs up, you get
> dropped
> > > >>> back
> > > >>> to the ringing.
> > > >>>
> > > >>> Imagine you are seizing a Herz toll-free
> > > ringback!
> > > >>>
> > > >>> 1-762-2600 or 1-762-2601
> > > >>>
> > > >>> Don
> > > >>>
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