Busy lines/locked lines

[consta]

Good day team.

I have been working with this Mitel 3300 system and have been having problems with busy trunks, there are three analog hunt grouped lines going to the controller from the service provider and three other lines which they are extension from a Nortel pbx.
 we have found out , when the three extensions are plugged to the controller and calls are made from the Nortel pbx to any of the mitel extensions or the other way round once the call hangs up, it busy out which ever trunk is active, analog lines / ext lines from  Nortel pbx.
Also we went on removing those extension lines for two day from the controller and did not have not one busy trunk but once the extension lines are place onto the controller this is where the complications begins.
There's no one on  busy lines 2 1 1 7 and 2 1 2 9.

  Location    | Device               | State         |  Owner  | ID   |Status   
----------------------------------------------------------------------------   
 2 1  1   1   | ONS on Embedded ASU  |Idle           |         |      |         
 2 1  1   2   | ONS on Embedded ASU  |Unassigned     |         |      |         
 2 1  1   3   | ONS on Embedded ASU  |Idle           |         |      |         
 2 1  1   4   | ONS on Embedded ASU  |Idle           |         |      |         
 2 1  1   5   | LS on Embedded ASU   |Idle           |         |      |         
 2 1  1   6   | LS on Embedded ASU   |Idle           |         |      |         
 2 1  1   7   | LS on Embedded ASU   |Busy           |Call Proc|1 032B|Wait     
 2 1  1   8   | LS on Embedded ASU   |Idle           |         |      |         
 2 1  1   9   | LS on Embedded ASU   |Idle           |         |      |         
 2 1  1  10   | LS on Embedded ASU   |Idle           |         |      |         
----------------------------------------------------------------------------
 Location    | Device               | State         |  Owner  | ID   |Status   
----------------------------------------------------------------------------   
 2 1  2   1   | ONS on Embedded ASU  |Unassigned     |         |      |         
 2 1  2   2   | ONS on Embedded ASU  |Unassigned     |         |      |         
 2 1  2   3   | ONS on Embedded ASU  |Unassigned     |         |      |         
 2 1  2   4   | ONS on Embedded ASU  |Unassigned     |         |      |         
 2 1  2   5   | LS on Embedded ASU   |Idle           |         |      |         
 2 1  2   6   | LS on Embedded ASU   |Idle           |         |      |         
 2 1  2   7   | LS on Embedded ASU   |Idle           |         |      |         
 2 1  2   8   | LS on Embedded ASU   |Idle           |         |      |         
 2 1  2   9   | LS on Embedded ASU   |Busy           |Call Proc|3 0326|Wait     
 2 1  2  10   | LS on Embedded ASU   |Idle           |         |      |         
----------------------------------------------------------------------------   
we then have go to the command line, amazingly which ever circuit  we busy and rts command automatically the trunk on the other circuit which was busy would released and go back to normal state. Say we busy and rts 2 1 2 9 , 2 1 1 7 will automatically release and go back to normal state. Help needed ASAP.

Any ideas of my dilemma .
Thanks much.
http://www.mitelforums.com/forum/Smileys/default/smiley.gif

[ralph]

The problem is that neither the Mitel or the Nortel provides disconnect supervision when using analog station ports connected to trunk ports.

What is happening is that (for what ever reason) calls coming in from the Nortel are being transferred back to the Nortel. 
You should see this in SMDR records after you clear it.
If you put your butt set on the lines you may hear a tone coming from the Nortel.

The only thing you can do to stop this is to block these lines from connecting to each other without a Mitel phone being involved.
Set the "Public Network to Public Network Connections allowed" to 'No'.

That should fix it.

Ralph

[tomj]

Hi Consta

If you monitor these analogue lines, do you hear a tone when the far end clears down?

If so you can enable CO Tone Disconnection, the system will "listen" for these tones and disconnect the line. It can be tricky establishing the disconnect tone and frequency but when you find this out your trunks will disconnect correctly.

What you can do is forward an extension to voice mail, ring in via the analogue line, wait for the call to forward to vmail, hangup, the remote CO or PBX will send the "tone" disconnet which will be recorded in the voicmail. You can then analise this to establish the tone frequency and cadence.

[ralph]

If so you can enable CO Tone Disconnection, the system will "listen" for these tones and disconnect the line. It can be tricky establishing the disconnect tone and frequency but when you find this out your trunks will disconnect correctly.

Tomj,
This is something I haven't tried.   What form are you setting this at?   Call Progress Tone Det?
How would you use it in the dial stream?

Ralph

[jrg0852]

As Ralph stated, we had to do this fix (the one he said) to a site that is giving us Avaya analog extensions. It fixed it and no complaints at the functionality they loose.....lesser of 2.

[tomj]

Hooking up LS Trunks to PBX analogue extensions can be tricky as these may not provide disconnect supervision.
Use a test butt telephone to monitor the line when the far-end clears.

Embedded or ASU Trunks (from Release 8 or 9) support, Line break, line reversal or tone disconnect supervison.

Trunk Circuit Descriptors - CO : Call Clearing Signal : reversal  or disconnect : Disconnect Timer=500mS (default)

CO Tone Detection : It can be tricky confirming tones, levels, frequency & timers but works well when configured correctly.

Hope this helps!

[consta]

Thanks much for the support.

Tomj, i have  monitor these analogue lines, and receives  a tone when the far end clears down. also Ralph i have set Public Network to Public Network Connections allowed" to 'No', but stilling have the same issue.

My question is do i configure a separate COS  and  CO Trunk Circuit Descriptors for the Nortel extensions  going into the controller or use the same setting already configured for the analog lines.

[ralph]

The COS settings will have to be set on the Trunks as well as the stations.

Ralph

[tomj]

Download a free tone minitor software such as http://www.nch.com.au/wavepad/index.html and use this to confirm the disconnet tone frequency, level and cadence, then configure the MCD CO Tone Disconnect.

[consta]

Hey Guys still no luck!
 I'm fighting this battle of "Busy trunks" any other ideas  or does anyone wants to over see whats going on the controller to get a better understanding of my battle?
 

[tomj]

Hi Consta

I have  monitor these analogue lines, and receives  a tone when the far end clears down.

This confirms the far end is using "busy tone" disconnect and not line break (the deafult setting).
To get the lines clearing properly you MUST establish the disconnect tone.

Do you have voice mail on the system? If so use this to record the tone.

1. Create a extension number and mailbox
2. Call Reroute Always the extension number to the voicemail hunt group
3. Dial into the system from outside, transfer to the extension - the call will forward to vmail - hang up at the far end
4. Use the maintenance command STATE <PLID>  (circuit of the trunk) to confirm it is busy, wait two or three minutes
5. BUSY & RTS the trunk PLID to release the trunk
6. Logon to the extension voicemail account, listen to the message, you should hear the tone

Now the tricky part, you need to analyse this tone to complete the CO Tone Detection Form, once done the trunks will disconnect.

[ralph]

Tomj,
I'm not clear on how you would use tone detection on trunks that are all ready connected.  Can you explain?


Consta,
Here's another trick to block trunk to trunk calls.   In the form "interconnect restrictions" pick an unused restriction number.  You could probably use 10.   In the 10, restrict 10.   Then in the trunk forms assign interconnect restriction of 10 to all your analog trunks.  This will block a trunk from connecting to a trunk.

Ralph

[consta]

Hey Tomj, the system dose  not have voice mail configured on the system.

I will try out Ralph trick and see whats happens.

[tomj]

Hi Ralph

When configuring LS (loop start) analogue trunks you assign a CO Trunk Descriptor to define a number of working parameters including the disconnect method. The default setting is “disconnect” (a current line break) of 500mS sent by the serving CO telephone exchange. You can change the disconnect timers or the method to “reversal” (a line polarity reversal) as required.

However, outside North America and the UK the CO public telephone exchange will send a “hang-up” tone as the disconnect signal. FXO/FXS equipment or PABX systems often do the same. In fact there is now a Mitel COS Option to do the same.

The reason trunks hang is because the CO telephone exchange/far end disconnect signal is not understood by the system, either because the CO Descriptor disconnect method is wrong and or the disconnect timer is incorrect. Use an in line multi-meter and test-butt telephone to confirm line break, line reversal or hang-up tone.

Back in Release 8.0 Mitel introduced Hang-up files within the system software Product Support directory which you had to ftp to the system later simplified with the introduction of the CO Tone Detection Form. There is a Tech Note on this "older" method somewhere.

If you are lucky your telephone company will confirm the hang-up tone if not you will need to record the tones and use a freeware program to analyse them. I’ve forwarded an incoming call to voicemail, recorded the tone, ftp the recording to a PC and used a freeware program to analyse. You then complete the CO Tone Detection Form, reboot the system to activate. Can't work hwo to paste an image but see attachment copied from other post - this shows a completed CO Detection Form

Tom

[ralph]

In my experience that since he's connected to a Nortel PBX via Nortel station ports he won't get a disconnect or reversal.  He'll get station dial tone back.

Ralph