sundance-communications.com/forum Forums TDM Business Telephone Systems Mitel Telephones & Systems SX-200 ICP Phone LInes Hanging

I have some systems that I service that are experiencing the same issue. The phone lines are getting hung up on them-selves. When I get a call from the facility stating that their phone lines are locked up, I log in, and am able to see that the lines are basically talking to themselves. The facilities do not transfer out for any reason. I have tried a couple different things for one of the systems, and have had no luck. Systems in question are AX controllers, and the telco is providing dial-tone via broadband/fiber. Any thoughts or input would be greatly appreciated. I'm not having any luck in getting this issue resolved.

Go into your trunk descriptors, and lower the 'disconnect timer' from the default of 500ms. That will make it more sensitive to disconnect signals.
Also, run the LS Measure diagnostic, and allow the Mitel to automatically adjust the trunk levels.

If no one makes trunk to trunk calls (e.g. conference) then go to form 3, and option disable 313 Co to Co trunk connect. I would also go to form 30 and remove intersection for trunk and trunk. If you do this, the trunks can never be connected to each other.

The Mitel does respond to CPC. Is the LEC providing CPC on disconnect?

Rcaman

I don't know the definition of CPC. Could you enlighten me, please?

I've also tried running an LS Measure test on one of the systems, but received a message indicating that the test failed and to check the milliwat tone source. I've cross-referenced this with the other systems that I have successfully ran the LS Measure test on, and found nothing to be wrong. Any ideas on this?

Towards the bottom of the circuit descriptor programing, there is an entry for a milliwatt test source, and a silence test source.
Make sure those are all BLANK.

CPC Calling Party Control is a signal sent by the Central Office indicating the call has terminated. A modern CPC is an open circuit condition lasting around 500 ms. Most telephone systems have the ability to recognize this as the call has ended.

Rcaman

I've definitely checked that, and they are blank. Any other thoughts on that issue?

Thanks for the info, Rcaman.

Another question I have is regarding a disconnect timer. The telcos that I'm dealing with are providing dial-tone over broadband connections. It sounds like they are not providing any sort of positive disconnect. Is there anything in the Mitel that would allow it to disconnect the trunks on it's own without the disconnect signal coming from the telco? Hopefully that makes sense.

No system will be able to deduce this on its own; it will need a disconnect signal. In the old days the CO switch reversed the tip and ring (battery reversal) but crossbar switches aren't around anymore. A modern disconnect signal is a battery drop. How long of a drop depends on the CO switch. I would definitely lower the disconnect timer as Fred suggested. This is how long the Mitel detects battery drop before deciding the call has ended. I've seen battery drop signals as short as 50 ms. In fact, the Mitel 5000/MiVoice products default their disconnect timer to 50 ms.