[Freeswitch-dev] Call relaying (ISDN <> Freeswitch <> ISDN)

[Markus Müller]

Hi all,
> hi Markus,
> how do you determine if it's a complete number? Do you expect the
> outgoing ISDN channel to tell you that?
Sorry that I don't have all details; I am not as familary as I want to
with the ISDN protocols. But I know that each number goes one by one to
the outgoing ISDN and then outgoint ISDN tells you back when you have
reached a destination. If needed I can make a log when I have my Siemens
Hipath placed behind my Freeswitch in NT mode; there you can see the
numbers comming one by one.
>
> I also wonder what happens if you attach an ISDN-SIP gateway, like
> Patton. Will you have a new SIP message (which?) on every dialed digit?
Normaly all the products do the "overlap dialing" crap, as mentioned in
my first email. I don't know for sure but I think there is no
alternative, especially if you make only SIP and not ISDN.

No comments about my design suggestion?

Regards,
Markus
>
> ------------------------------------------------------------------------
> *From:* Markus Müller <freeswitchdev at priv.de>
> *To:* freeswitch-dev at lists.freeswitch.org
> *Sent:* Saturday, September 7, 2013 1:52 PM
> *Subject:* [Freeswitch-dev] Call relaying (ISDN <> Freeswitch <> ISDN)
>
> Hello Freeswitch Developers,
>
> ISDN in germany (maybe also somewhere else) has a feature, which colides
> with the design of a dialplan: it sends the numbers the user types into
> his phone LIVE (!) through the ISDN network. If the number is complete,
> the ISDN network tells it to the caller; Only now the call get
> established (means the dialplan gets invoked). So you have to do an own
> step (live and interactive determination of the number) BEFORE the
> dialplan comes in line.
>
> Because this is object not supported by freeswith, in the following
> situation
>
> User <-> Analog Phone <-> Siemens Hipath <-> ISDN <-> [FreeTDM <->
> Freeswitch <-> FreeTDM] <-> ISDN <-> World <-> ISDN Destiation
>
> you have to do "overlap dialing". Means, freeswitch waits some seconds
> until the user has entered the last number and then it goes directly to
> the dialplan.
>
> -> This is not what I need!
>
> I want that it works as if there is no FreeSwitch in between. Means,
> freeswitch should relay each number the user types into his phone to the
> ISDN on the remote side, and make the dialplan stuff AFTER the number
> has been dicovered for completeness.
>
> How do you think this should be implemented? If nobody has an object, I
> would code this the following way into FreeTDM: If I get a call with a
> starting number I know that it must go to the external ISDN (means: a
> second dialplan), I first relay the typed numbers and determine the full
> number. Only now, when I got the full number, I would give this call to
> the higher layers.
>
> What you think about this?
>
> Regards,
> Markus Mueller
>
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