[Asterisk-Users] UK ISDN2e with DDI?

[David Cook]

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com 
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Dogers
> Sent: 07 December 2005 16:24
> To: john at argv.co.uk; Asterisk Users Mailing List - 
> Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] UK ISDN2e with DDI?
> 
> Quoting John Daragon <john at argv.co.uk>:
> 
> > Patrick Lidstone (Personal E-mail) wrote:
> > >>We're about ready to go ahead with a nice 6 line (maybe later
> > >>8) ISDN setup with Asterisk at Home and the quad Junghanns card.
> > >>
> > >>Before we do, could anyone confirm for me that BT's 
> ISDN2e lines do 
> > >>actually provide Asterisk with the DDI number? We need to 
> be able to 
> > >>route incoming calls based on which number is ringing.
> >
> > Yes they do. For DDI ranges you'll need to ask BT for a 
> "System Access"
> > installation (sometimes known as "Point-to-Point") and 
> configure the 
> > Junghanns appropriately.
> 
> I'll have to check that, I guess - find out what they're set as!
> 
> > I'm probably just an old fogey with a programming background, but I 
> > find straight Asterisk *so* much easier to configure than a at h.
> 
> True, I've used bare Asterisk at home for my small get up, 
> but A at H just does everything we need it to do here at the 
> office (including the "nice and pretty"
> call log side of things that AMP provides!)
> 
> > When you say "ringtones", do you mean "sounds like a UK 
> phone when it 
> > rings", or "sounds like a UK phone when we ring someone else" ?
> 
> It does actually sound okay when we ring someone else, but 
> when it rings, it has the long single american style ring. 
> I've come across a few places that claim its built into the 
> Grandstream and I'd have to create and upload a new one..
> but I've also found others that say to edit various config 
> files, which has had no effect (indications.conf and 
> zaptel.conf both have the zone as uk.. Theres nowhere else it 
> needs to be set, is there?).
> 
> Andrew

Try adding the following to your handset config in sip.conf. This forces the SIP device to get it's ring tones from Asterisk. Worked for us in v1.0.9 with Polycom handsets.

progressinband=yes

Be careful when ordering an ISDN2e line from BT. By default they come configured as Point-to-Multipoint with any additional numbers as MSNs. Most PBXs are better with ISDN2e Point-to-Point with DDIs, but BT then sting you for a £100 DDI planning fee in addition to the ISDN2e installation. One thing to consider is that DDIs are allocated in contiguous blocks of 10 numbers e.g. 0115 7889100 - 7889109. MSNs however are purposely allocated by BT randomly in what ever quantity you require. Officially you cannot have contiguous MSNs which aren't so good for PBX use.

If you want inbound CLI display (CLIP) and/or the ability to specify the outbound number you are presenting as a CLI (CLOP/COLP depending on who you are talking to) this needs to be specified as well. By default you get neither but both are non-charegable upgrades (in our limited experience).

David Cook