Trunks Not Releasing

[britten]

I have two SX200 systems that every once in a while will have 3/4 of their trunks seized but no one on them. I believe this is caused by them doing trunk to trunk transfers. I am afraid that I am missing something in Form 13, but I have other systems with the same settings in Form 13 and they dont have this problem. Any suggestions?

 

[TheMitelGuy]

It is assumed these are 1FL's (analog lines) and these are on a SX-200 TDM with a LS/Class card in the per. node?

1) What are the settings you have for the trunk descriptor?
2) Is it is the same trunk every time?

Unless you have two trunks locked up, I doubt it is a trunk to trunk transfer that is the issue. REASON: When your SX-200 (TDM or ICP) does a trunk-2-trunk transfer call controll is passed to the trunks, so if one clears down the system will clear down both channels.

Neil

 

[mitelman]

If they are loop start lines you might not be getting proper answer supervision from the CO. One thing you may want to do is disable the conferencing features for those that do not need it. That cuts down on a lot of this type of problem. Also you say your circuit descriptors are the same, but are the trunks the same, i.e. loop start or ground start?

 

[britten]

Yes these switches are both Sx200s with LS trunks on LS/CLASS cards and yes both trunks are locked up, when I short out one of the locked out trunks and return it to service so does another. I thought it would have something to do with supervision from the CO, but I was wondering what I should set my supervision perameters in Form 13 to.