From: Larson, Chris (CLarson@usaid.gov)
Date: Fri Nov 22 2002 - 10:28:13 GMT-3
I am pretty sure this is a function in the ISDN modem not the switch. You
are assigned 2 numbers from the Telco. One for each B-channel. If you watch
the debug on the ISDN line you can see that when you dial the same B channel
twice that the ISDN checks then rings the second B channel.
I can do this in real world and in my lab using and ISDN simulator.
> -----Original Message-----
> From: Leo Song [SMTP:lsong@dataphile.ca]
> Sent: Thursday, November 21, 2002 4:36 PM
> To: 'miken'; 'Karl Brusen'; 'ccielab'
> Subject: RE: ISDN: One or Two Dial Strings
>
> Even in metro Toronto and Vancouver, the Telco won't do that by default,
> unless you upgrade your packet, on the other hand, pay a little more
> rental.
>
> Leo
>
>
> -----Original Message-----
> From: miken [mailto:miken@sisna.com]
> Sent: Thursday, November 21, 2002 4:25 PM
> To: Leo Song; 'Karl Brusen'; 'ccielab'
> Subject: Re: ISDN: One or Two Dial Strings
>
> Leo,
>
> To use one dialer string to bring up both channels, the telco must setup
> a
> rollover from the first b channel to the second b channel. The telco
> switch
> will receive a second call setup to the same number and need to rollover
> to
> that second channel. I think that it is totally dependant on the telco
> side
> to get this to work correctly. Bridging would be an example of this. If
> they
> can't do it, and I have seen this in more rural areas using legacy
> equipment, then you will probably have to use two dialer strings.
>
> HTH,
> Mike
>
> ----- Original Message -----
> From: "Leo Song" <lsong@dataphile.ca>
> To: "'Karl Brusen'" <karl@brusen.com>; "'ccielab'"
> <ccielab@groupstudy.com>
> Sent: Thursday, November 21, 2002 1:03 PM
> Subject: RE: ISDN: One or Two Dial Strings
>
>
> > When your calling router try to bring up the second channel, in case
> > there is one dial string only, so the calling router would call the
> same
> > number again.
> >
> > 1. the remote ISDN switch detect the incoming call address the same
> > number / channel while the channel is already connected, so it would
> > response you with BUSY.
> > If you calling router configure another dialing string, then your
> > calling router would give it a try, so in that case, say the Telco
> ISDN
> > switch doesn't support / configure hunt-group function, then you have
> to
> > configure two dial strings / numbers.
> >
> > 2. the remote ISDN switch detect the same info as 1, while it was
> > configured with hunt-group so it would automatically shift to the
> second
> > number / channel, in that case, you only need to configure one number
> /
> > string.
> >
> > Correct me if I was wrong.
> >
> > Leo
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Karl Brusen
> > Sent: Thursday, November 21, 2002 12:42 PM
> > To: ccielab
> > Subject: ISDN: One or Two Dial Strings
> >
> > Can anyone tell me when to list the dial strings for both BRI channels
> > and
> > when to list just one (dial string of map statements)? I have seen it
> > done
> > both ways. I apologize if this issue has been discussed previously.
> > Couldn't find an answer in the archives.
> >
> > Thanks,
> >
> > Karl Brusen
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