avayapbxuser

We have an Avaya Definity G3v11 PBX system, and we are trying to move our 800 numbers from our Megacom trunk group to another Trunk group. We have all the associated DNIS digits, but can not locate them on the Megacom trunk group, as there are no entries for DNIS digits. We need to program the new trunk group with these DNIS digits, but can not figure out how the calls are being routed to this Megacom Trunk group to move them over. I do not see this particular trunk group number listed in any of the Route Patterns and can not figure out how calls are being routed to this trunk group.

martinyoung

Routing by DNIS number is done by the service provider, by the time the call lands in your PBX it already has its' DNIS assignment. You will need to talk to them.

They will need to reroute the calls in the CO. If this involves using a different vendor for your 800 traffic, you will need to co-ordinate it.

Route Patterns are only used to route outgoing calls, they have no impact on incoming calls.

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Marty
Retired Avaya DSIC tech

PBXtech.info

 

fataldata

The DNIS digits are assigned and routed by the your service provider and then are sent to you on the trunk you specify to them. When these digits arrive on the trunk it is up to you to set up either stations or vdn's. Just my 2 cents but almost all of our 800 #'s are set up in a range of VDN's which correspond to the DNIS digits.

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Systems In Use:
S8700 CM3.0 and S8710 CM3.1.1

avayapbxuser

We do have VDN's setup for these 800 numbers, and the VDN's go to a Vector. The question is how is the VDN 2xxx being routed to our Megacom Trunk group? I've checked everywhere in the PBX and I can not determine that. Any insight on incoming call routing??

oozenoz

The digits ARE assigned to your trunks - but not within your switch. They are assigned to your trunks in the TELCO's switch.

[Telecom basics 101]

The first thing you have to understand is that the PBX you have at your location is simply a smaller version of the type of switch used by telcos in their main central offices and terminals. The same sort of digit analysis, using complex sets of tables, are used to route calls between local and long distance carriers, and to deliver calls to local premises. Whether calls are delivered over analogue lines or trunks, digital facilities with advanced features, toll free or WATS or MEGACOM, each and every call made into the PSTB is analyzed, routed, and delivered in pretty much the same way.

Let's take a call from start to finish - from a very high level. To keep it simple, let's assume you and I have the same local service provider, but we receive our local service from different central office switches because we are on the other side of the city from each other.

I pick up my POTS phone at my home and dial a number that is within your DID range. The CO switch from where I get my dial tone analyzes the number to determine where it goes - just like your PBX would do if you were dialing out. MY CO switch then routes the call according to it's rules - which say the call has to go through network trunks to YOUR CO switch.

YOUR CO switch receives the call, analyzes the digits, and determines it is within its own service area and the call needs to be delivered to your premise PBX. Nothing about the digits dialed have been changed at this point.

So, now the call is at YOUR CO switch, ready to be delivered. It knows which T1 to send it to using its internal programming - again in a similar way that your PBX knows how to route an outbound call. YOUR CO switch also knows that you are only supposed to get the last 4 digits (using Dialed Number Identification Service ) so it strips off the beginning digits and routes the call to your local premise PBX. Your PBX then acts on the call using the digits received.

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- calvin

avayapbxuser

Thanks for the refresher 101 course. I understand the basics. Our LD provider is telling us that they are sending DNIS digits of 2xxx to our PBX, at that point we determine what trunk group it rides over; that's what I am trying to determine how the PBX is programmed to choose a specific trunk group for incoming calls. Or does the LD/LEC provider determine which T1 to send the DNIS digits to and that's how it gets to a specfic trunk group in our PBX.

PBXtech.info

 

oozenoz

Sorry, but from the question you posted (How are the DNIS digits being directed to the Megacom trunk group...) I rather assumed that you did not understand routing based on digit analysis.

You are responsible for telling telco how you want your trunks to be used, so that they can be programmed for that purpose. In the case of your MEGACOM service, you have to tell the provider which T1's to use - so that you know which T1's the calls will be terminating on. This is different from deciding which trunk will be used on a call.

The sending switch is responsible for selecting the available trunk. If the other end (receiving) has no issues with using that trunk (e.g., glare or OOS condition) then that trunk is used. If it is not, the sending side will follow it's own protocol for either re-attempting on a different trunk or tearing down the call.

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- calvin

avayapbxuser

Thanks I appreciate all the feedback on this. It's been very helpful. :)

martinyoung

You have received some very good answers that explain the issue in some detail, let me add one more detail just to help clarify any remaining confusion.

Let us say that you tell your vendor that you want the 800 numbers to land on your PBX with a DNIS of 2100. They will send them to you with that DNIS. It is your responsibility to assign 2100 to a VDN, hunt group, or station to answer the calls.

If you wish to change the trunk group that the calls come in on you must work with the vendor on that. If you are changing vendors you will need to work with both vendors. If you keep the same DNIS on the new trunk group, you should have to make no changes in the PBX for it to work.

__________________
Marty
Retired Avaya DSIC tech