[Freeswitch-users] att_xfer and loopback

Tue Jun 5 23:54:31 MSD 2012

We appreciate the validation. Any chance you could find a place on the wiki
to add this hard-earned knowledge?
-MC

On Tue, Jun 5, 2012 at 12:44 PM, Jeremy Childs <jeremyc at ssimicro.com> wrote:

> Updated to the latest git, so I can verify:
>
> {ignore_early_media=ring_ready,loopback_bowout_on_execute=true}loopback/foo
>
> does the right thing
>
>
> {ignore_early_media=ring_ready}loopback/foo
>
> Bridges all 3 legs together immediately (not the right thing).
>
>
>
> On 12-06-04 11:03 AM, Anthony Minessale wrote:
> > This thread is all FUD now, please disregard above.
> >
> >
> > att_xfer and loopback endpoint are both crutches but they work at the
> > cost of elegance since you are doing emulated behaviors.
> >
> > Your problem probably comes from the loopback bow-out happening too
> > soon that tries to cut its way out of the call..
> >
> > You should be looking at logs and finding the root of the problem not
> > guessing at things.
> >
> > My recommendation:
> >
> > 1) Make sure you are on latest GIT we have fixed a few issues in both
> > in the recent past.
> > 2) try
> {ignore_early_media=ring_ready,loopback_bowout_on_execute=true}loopback/foo
> > in your dialstring  --- This may eliminate the loopback right off the
> > bat.
> > 3) try {ignore_early_media=ring_ready}}loopback/foo ---- it may just
> > need to wait for the call to be answered.
> > 4) try {loopback_bowout=false}loopback/foo --- the bummer here is it
> > will never eliminate loopback
> >
> >
> > On Mon, Jun 4, 2012 at 10:57 AM, Jeremy Childs<jeremyc at ssimicro.com>
>  wrote:
> >> I'm also very interested in some answers! I've been bitten by att_xfer
> in
> >> the past.
> >>
> >> Is getting dialplan processing working within the att_xfer function
> >> possible, and just a low priority for implementation, or is there some
> >> technical reason why this is not feasible?
> >>
> >> Lastly, is this somewhere that execute_extension can help? I've never
> been
> >> able to get it to work inside att_xfer.
> >>
> >>
> >>
> >> On 12-06-04 8:53 AM, Dmitry Sytchev wrote:
> >>
> >> I asked this question many times on mailing list, and now I'm sure this
> >> can't be really done with loopback.
> >> The only alternative for loopback is to re-inject call into FS via some
> >> separate Sofia profile, and specify that profile in string for att_xfer.
> >> This brings up large amount of troubles including DTMF transcoding,
> >> sequential att_xfer attempt recognition and overall voice/dtmf delay
> >> introduced by chained channels. Maybe some channels can be moved out of
> >> scene by using 'simplify' api on correct channels, but this needs tests.
> >>
> >> Anyway, loopback channel in FS is completely unusable, so we do need to
> have
> >> some  best practices on how to do things without it in FS wiki... Maybe
> I
> >> have time and will describe our experience soon.
> >>
> >> 2012/6/4 Michael Collins<msc at freeswitch.org>
> >>>
> >>>
> >>> On Sun, Jun 3, 2012 at 2:15 PM, Avi Marcus<avi at avimarcus.net>  wrote:
> >>>> I know you can do anything in the dialstring. But intended feature is
> to
> >>>> allow the user to do an attended transfer to any number that they
> could
> >>>> reach via the default calling. The default outbound path already has
> a LOT
> >>>> of stuff set up and it would be impossible to duplicate that within a
> SINGLE
> >>>> dialstring in a function call.
> >>>> What is needed is for an att_xfer to be able to have leg C hit the
> >>>> dialplan and bridged however a "normal" leg B to that number would be
> >>>> called.
> >>>> Does this make sense?
> >>> Perhaps, but I remain unconvinced that this scenario is impossible
> without
> >>> loopback. How about the OP actually supply a sample Lua script and
> dialplan
> >>> and call log? I'd be willing to wager that the gurus could come up
> with a
> >>> non-evil alternative that actually works. Just because loopback seems
> like a
> >>> clean solution doesn't necessarily mean that it is. I'll leave it to
> Anthony
> >>> to give the technical reasons why loopback doesn't always work as one
> would
> >>> expect or why it should be avoided wherever possible.
> >>>
> >>> -MC
> >>>
> >>>> -Avi
> >>>>
> >>>>
> >>>>
> >>>> On Mon, Jun 4, 2012 at 12:02 AM, Michael Collins<msc at freeswitch.org>
> >>>> wrote:
> >>>>> Au contraire mon frere!
> >>>>>
> >>>>> You can do multiple things in a dialstring, like setting channel
> >>>>> variables. You can also use execute_on_ring/media/answer to execute
> the
> >>>>> extension with doing all the loopback overhead.
> >>>>>
> >>>>> I propose an experiment: provide a dialplan and loopback dialstring
> and
> >>>>> we'll see if we can't give you a non-loopbackish alternative.
> >>>>>
> >>>>> -MC
> >>>>>
> >>>>>
> >>>>> On Sun, Jun 3, 2012 at 1:54 PM, Avi Marcus<avi at avimarcus.net>
>  wrote:
> >>>>>> ... all the normal dialplan handling. Setting CID, options, LCR
> stuff,
> >>>>>> billing controls.
> >>>>>> -Avi
> >>>>>>
> >>>>>>
> >>>>>> On Sun, Jun 3, 2012 at 11:40 PM, Michael Collins<msc at freeswitch.org
> >
> >>>>>> wrote:
> >>>>>>> Let me rephrase...
> >>>>>>>
> >>>>>>> Since loopback is generally evil and should be avoided wherever
> >>>>>>> possible, what does loopback give you that you can't get from
> doing a normal
> >>>>>>> dialstring?
> >>>>>>> -MC
> >>>>>>>
> >>>>>>>
> >>>>>>> On Sat, Jun 2, 2012 at 11:13 AM, Avi Marcus<avi at avimarcus.net>
>  wrote:
> >>>>>>>> ... because att_xfer seems to require a
> "sofia/$profile/$destination"
> >>>>>>>> directive, and he just wants the call to hit the dialplan.
> >>>>>>>>
> >>>>>>>> -Avi
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> On Fri, Jun 1, 2012 at 8:13 PM, Michael Collins<
> msc at freeswitch.org>
> >>>>>>>> wrote:
> >>>>>>>>> Why do you need to use loopback at all?
> >>>>>>>>> -MC
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>> On Fri, Jun 1, 2012 at 3:17 AM, Alex Lake<alex at digitalmail.com>
> >>>>>>>>> wrote:
> >>>>>>>>>> Got a lua script for a B-party "mid-call menu". Is it
> legitimate to
> >>>>>>>>>> do..
> >>>>>>>>>> "session:execute("att_xfer", "loopback/"..destnum)"
> >>>>>>>>>>
> >>>>>>>>>> I've tried it and it seems to start off doing the right things,
> but
> >>>>>>>>>> my
> >>>>>>>>>> A-party gets disconnected as soon as the call to the C-Party
> (the
> >>>>>>>>>> person
> >>>>>>>>>> I'm transferring the call to) answers the call.
> >>>>>>>>>>
> >>>>>>>>>> Maybe better to try to orchestrate the entire affair from within
> >>>>>>>>>> the lua
> >>>>>>>>>> script? (Tricky for a beginner like me!)
> >>>>>>>>>>
> >>>>>>>>>> Thanks,
> >>>>>>>>>> Alex
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>
> >>>>>
> >>>
> >>>
> _________________________________________________________________________
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> >>>
> >>> 
> >>> 
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> >>
> >>
> >> --
> >> Best regards,
> >>
> >> Dmitry Sytchev,
> >> IT Engineer
> >>
> >>
> >>
> _________________________________________________________________________
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> >> http://www.freeswitchsolutions.com
> >>
> >> 
> >> 
> >>
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> >>
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> >>
> >>
> _________________________________________________________________________
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> >>
> >> 
> >> 
> >>
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> >>
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> >>
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>
>
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> http://www.freeswitchsolutions.com
>
> 
> 
>
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