Centrex calls going to local number

[rconn]

Hi all,
The following phone numbers are examples only and repeat a pattern as required to show the problem.

This may require a knowing DMS 100 technician. I have a customer who repeatly gets calls from several schools in the same school board and each school is located within the same exchange (739). These schools have centrex service but I don't believe the use the feature of 4 digit dialing between schools. The customers number repeats the local exchange number for example 739-7399. In the school they have to dial 9 to dial outside of the centrex group and access the PSTN. If a teacher or student simply accesses an outside line directly for example line 2 and does not dial 9 first then the call is treated as a centrex call and should be routed if the number dialed is valid within the group. If the teacher/student starts dialing a local number such as 739-9XXX without dialing 9 first, the call is routed to 739-7399. As long as the first four digits dialed are 739-9 every call comes to him. That makes a possible 1000 numbers coming his way from the schools. The local telco has confirmed that his number 739-7399 is not a member of the centrex group and 7399 is not a valid number within the group but can do nothing to stop the calls.

I am hoping someone who has an intimate knowledge of the call processing within the switch can offer a solution as I believe the local telco can fix it but need a little direction. ("That's the way it works." was the technical explanation)

I believe a work around could be programmed through the school switches but they do not want to pay for the technician.

Rob

 

[rconn]

I'm sorry about the double post. Let's work with this one.

Rob

 

[jgideon]

Is it possible that extension 7399 in the Centrex was mistakenly forwarded off-system to the 739-7399 number? Repair should be able to look at the Centrex station and confirm if call forwarding - variable is active or not. I'm not a translations person, but normally in a Centrex there has to be a 'station' length. I've seen 7 digit, 5 digit, 4 digit, and 3 digit. There can be an 'assume dial 9' so that the Centrex user doesn't actually have to dial the access code, but then everything they dial would be interpreted as a 7 digit local call (if your local calling area is a 7 digit dial area.)

 

[rconn]

7399 is not a valid extension in this group. When anyone dials 7399 from the centrex dialtone they reach 739-7399. It is seems like it it accessing the PSTN and inserting the 739 in front of the 7399. It 4 digit dialing within the group and I don't believe the the 9 is assumed. It is regular centrex service but I don't think they use the 4 digit dialing between the schools.
The centrex service we have here for small business is called "Local Link" and the 9 is assumed. I have this service myself. I have all the features of centrex on my one phone line but get a better rate than using the standard service ofering.

I believe it is a translation problem. We need to convince the telco to send an experienced tech out to test with their centrex testers. I don't think they are convinced yet. I worked as a tester for several years and they should be able to plunge for dialtone from one of the lines a try it for themselves.

The calls to the customer have originated from almost every school in the group. I suspect he has not had calls from some schools simply because they always dial 9 first or no one has dialed a 739-9XXX number.

Rob

 

[SYQUEST]

Sounds like you have a translation problem with the Centrex COMMON BLOCK! If the number completes from the Centrex it is in the block. Since all the DNs in the switch have a ROUTE INDEX that might be a good place for the telco to start. They need to verify all of them. If you have not had any luck with basic repair service, then escalate the ticket to a supervisor or first level person. Also request the ticket number and a timely callback.

I have had a similar situation in the past when telco cutover a 1A ESS which had serveral large Centrex customers to a DMS100 switch. In this case the 2 lines required 9 for out calls and I could call any Centrex station(5 digit calling). This happened to be Pacific Bell's LSANCA07 office, the one that serves the airport, LAX. The interesting thing in this case was we never got billed for any calls.

Hope this helps!

....JIM....

 

[rconn]

Thanks for the information Jim. My work with DMS offices was when I worked in a Test Centre before centrex became very popular. When I get back to this I am hoping to find a tester/tech with a little more interest in getting to the bottom of this. Having a few terms or ideas will get them thinking I hope.

Thanks again

Rob