atcomsystems.ca/forum Forums Other TDM Phone Systems Sprint - Tadiran Telephones & Systems What woudl cause an SLT ro ring back?

Bingo! I knew there was a way to address this. If the SLT port can send *# upon disconnect, the E-30 will drop out right away. I'd have it send *# several times, just in case.

According to Viking's docs, this is a fixed disconnect code, so it doesn't appear that "D" will suffice. Of course, the phone users could just be disciplined to dial *# manually before hanging up, but that won't last very long.

The CPC unit is doing nothing at all, so take it out right away.

The Disconnect tone is changeable but it is a system wide feature which may cause an issue if the Voice mail is looking for the D tone if the customer has Loop start trunks. If they have a PRI, I think it would be a moot point on using D as the disconnect tone. .

My bad sorry, it is a K1700, not an E-30.

https://www.vikingelectronics.com/products/view_product.php?pid=152

It worked properly for months, so it has to be some setting in the Coral 500.

Have you upgraded the Coral system at all in the last few months or since the problem has showed up?

We still need to know what the system sends out to the SLT port once the stations hang up. Is it sending a busy, fast busy, DTMF or just silence?

Maybe the UCMC, but not sure if that is when it started happening.

I will try and find out what it is sending once it hangs up.

Main question,

You say it has been working fine. Now it doesn't. The first question is always, what changed?

There is one thing that appears to be obvious: The K-1700 is staying off-hook upon completion of the call for 40 seconds as is indicated in the Viking documentation. This would be indicative that only silence is being left on the SLT port when the internal party hangs up.

The CPC unit is detecting this silence prior to the 40 second time out and generating an open loop (flash). Since the K-1700 is still off-hook during this time, the system interprets this as a hook flash. Since nothing is dialed after this occurs, I'm assuming that the system must be recalling the original connection from the K-1700 as if the call never ended.

This would be similar to using a flash command when engaged in a regular call but not dialing anything. Most systems would ring the station back to avoid losing the call that was held by the flash.

I'm still a firm believer that the CPC unit needs to be removed from the picture. As for the answer as to what changed, I don't have a clue.

I would check to see if the SLT has mutli appearance set to N and hook flash, 3 way calling and call waiting hf turned off.

Sounds to me like the Coral is interpreting the hangup as an open loop interval and initiating 3 way calling or call waiting, of some kind, and when it hangs up it re-connects the call.

If I knew what changed, I would change it back.

The problem with removing the CPC is that I have 40 seconds of silence until the unit hangs up by the front door.

If their is no silence for 40seconds, no hang up of the Viking 1700.