atcomsystems.ca/forum Forums TDM Business Telephone Systems Comdial Telephones & Systems Executech

The customer has 8 lines, 5 lines are programmed to ring in the store (answered separately) and 3 lines are programmed to ring in the back office. The back office telephones only give a one ring (like a notification) on incoming calls and flash after the initial ring. The customer says the problem comes and goes.
Any help would be appreciated.

That was never a feature on the Executech system, so something is definitely wrong. We will need to know exactly which KSU is installed, since all Comdial systems during that era were called Executech. There are about 12 different models. There is a label on the right side beneath where the power cord enters with an American Flag on it. If you can get us the numbers on the labels, we can point you in the right direction.

I really think that this might be more of a CO line issue causing ring trip on the back office lines. Those KSU's are pretty tough and when they fail, it's 100%.

Another cause for this is when telco call forwarding is activated and forgotten. A single reminder ring is sent from the CO and heard on the phones, but nobody is there on the line. Could this be the case? Maybe someone is forwarding the lines and forgetting to take it off? Either of these situations would cause the phones to ring once, then continue with lamp flash until the incoming call timer expires. That would also explain the inconsistency with the problem.

By the way, welcome aboard!

Welcome telephony121!

Ed, I completely agree that this may simply be an instance where call forwarding is assigned/activated in the telco for the 3 rear office lines. When CF is activated, the "single ring" is also a standard option in the 5ESS, we call it BSR (base station ring) default = Y, used as a courtesy reminder to the user that call forwarding is activated.

But, it would only happen on line one. Call Forwarding breaks hunting. If it's all three lines CF is not the answer.
Mark

Thank you gentlemen for the responses, but I dont think its the the call forwarding variable from the C.O. The incoming caller is still on the line buttons when answered.
I am unsure of the ksu model (I will confirm), but I did notice no grounding on any of the system components. That could create some pretty erratic behavior over time...couldn't it?

Thanks again.

telephony121,
You definately want to make sure that all components are properly grounded. Are the 3 back office phones assigned in a hunt group? Is the "single-ring" occurring on each phone "individually", per each phone's incoming calls?

"The incoming caller is still on the line buttons when answered."

I'm not sure I completely understand "when answered"...I presumed that after hearing the "single-ring", the customer was losing the incoming call (either by CF or disconnect).

Can you explain this in further detail for us?

Try bumping up the volume control on each phone.

How many stations or telephones are on the back 3 lines?

The old exec's only had off, low, & high. When they are off you don't get an alert signal like the new digitals. I would doubt that grounding would only effect 3 lines and a few phones but grounding is important.

I'd connect a single line phone to the line at the interface and see if it behaves the same way when the office phones fail, this will determine if it's your equipment or if you should be looking ahead of the equipment toward the Telco.
Mark

You can also try placing a test call to one of the back office lines (when the customer reports the "single ring" occuring) to observe the call treatment.

We recently had a customer reporting a similar problem; we quickly determined that they had unknowingly misprogrammed their forwarding, sending all their calls out to Scott AFB, Illinios.