[asterisk-users] Real T1 trunk group...

[C F]

On Mon, Jan 16, 2012 at 5:48 AM, Louis Carreiro <carreirolt at gmail.com> wrote:
> Hey all!
>
> I'm not sure if this went out the first time I sent it so I apologize now if
> it's a duplicate.
>
> I've been banging my head against the wall for a while (almost 18 hours
> today alone) with this one... I migrated our incomming T1's from the Option
> 11 to our Asterisk box this morning. We have 1 local T1 and 2 long distance
> T1's. The local T1 went over with out a hitch. The problem is with my 2 long
> distance T1's. The switch on the other end is a DMS250 I'm told so I set
> Asterisk to DMS100 and got the timing, framing, etc all set. Well, the D
> channels came up so thats good. I started getting dropped calls every once
> in a while. I did a debug on the spans and saw the following:

I have found that in most cases the easiest way to fix these issues is
to simply call the provider and ask them to switch it to NI2. Most of
them can do that while on the phone.


>
> PRI Span: 3
> PRI Span: 3 < Protocol Discriminator: Q.931 (8)  len=40
> PRI Span: 3 < TEI=0 Call Ref: len= 2 (reference 857/0x359) (Sent from
> originator)
> PRI Span: 3 < Message Type: SETUP (5)
> PRI Span: 3 < [04 03 80 90 a2]
> PRI Span: 3 < Bearer Capability (len= 5) [ Ext: 1  Q.931 Std: 0  Info
> transfer capability: Speech (0)
> PRI Span: 3 <                              Ext: 1  Trans mode/rate: 64kbps,
> circuit-mode (16)
> PRI Span: 3 <                                User information layer 1: u-Law
> (34)
> PRI Span: 3 < [18 04 e9 80 83 08]
> PRI Span: 3 < Channel ID (len= 6) [ Ext: 1  IntID: Explicit  Other(PRI)
> Spare: 0  Exclusive  Dchan: 0
> PRI Span: 3 <                       ChanSel: As indicated in following
> octets
> PRI Span: 3 <                       Ext: 1  DS1 Identifier: 0
> PRI Span: 3 <                       Ext: 1  Coding: 0  Number Specified
> Channel Type: 3
> PRI Span: 3 <                       Ext: 0  Channel: 8 Type: CPE]
> PRI Span: 3 < [20 02 00 e2]
> PRI Span: 3 < Network-Specific Facilities (len= 2) [ Toll Free MEGACOM ]
> PRI Span: 3 < [6c 0c 21 83 37 32 37 34 3033 34 30 37 34]
> PRI Span: 3 < Calling Number (len=14) [ Ext: 0  TON: National Number (2)
> NPI: ISDN/Telephony Numbering Plan (E.164/E.163) (1)
>
> The key part is the "Ext: 1  DS1 Identifier: 0" part. That's when calls
> fail. Right now, all calls are coming in on span 3 and want to talk to
> Identifier 0 (span 2). If a call comes in on span 2 and requests "Ext: 1
> DS1 Identifier: 1", it fails. I called Verizon and asked them what was going
> on. Turns out, its configured as a trunk group. The tech mentioned that I
> need to figure out how to set my identifiers on the group and I should be
> good to go. I've done a ton of research about chan_dahdi.conf and
> dahdi-channels.conf and I think the answer is trunk groups.
>
> I tried configuring a trunkgroup and set the primary dch to 24 and the bdch
> to 72 and then then spanmap'ed span 2 and 3 into group 1 (e.g. 2,1,0 and
> 3,1,1) but I don't see anything when I do a "dahdi show channels" or a "pri
> show spans" or a "pri show channels", not even the channels not in the
> group. If I delete the trunkgroup, all three commands return all the
> channels.
>
> I'm just curious if I'm going down the right path with trunkgroups for this
> or if there is something else to take care of the DS1 Identifier issue.
>
> So another quick look... when a sucessful call comes in it goes to DS1
> Identifier 0... the Asterisk CLI shows the following:
>
>     -- Accepting call from '727403XXXX' to '890' on channel 0/11, span 2
>
> Is there a way to get the other span (span 3) to become channel 1/xx? So
> when a call comes in asking for DS1 Identifier 1 I see the following:
>
>     -- Accepting call from '727403XXXX' to '890' on channel 1/12, span 3
>
>
> Thanks in advance everyone!
>
> Louis
>
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