hipath 4000 incoming calls problem

[phonetech1]

Hi all,
I have a problem on our Hipath 4000, where the incoming co trunk call can only be answered when a console or a phone is ringing, but not between rings.

Any idea why this is happenning?
This PBX is used in the lab and that is how it was installed by our vendor.

I have many years on Hicom 300, but not on 4000.

Thanks for your help.

 

[donb01]

Wow, I'm really grasping at straws here because I never heard of this before. I also am all 9006 and no 4000, but some things just stay the same....

I guess the first place I would look are my trunk parameters to see if there are any funky signaling types or timing parameters set. If you have a 300 around look at the trunking parameters on there for a similar kind of trunk and see if there are any glaring differences. If so, make notes of how they are and change the parameters to match the 300. I'm sure you're aware that you may need to deactivate the trunks before you can modify some of the parameters, and some changes will apply to the whole trunk group that trunk is in (usually COS/COP).

Then I would look at the COS/COP assigned to the trunks - especially the COP. Compare that to a 300 as well. Some of the COP parameters can affect trunks if I remember right without looking in there - it's been a while since I had to mess with my trunking.

The thing I'm having trouble understanding is that once the call is signaled to a station you should be able to just grab it. I don't understand why the ring signal being high or low would have anything to do with it. But then again, that's why I'm not out in the field doing it for everyone!!

Hope the brainstorming session helps...

 

[phonetech1]

I've tried different sets of parameters for COP & COT, but so far it didn't do anything. The parameters are different from 9006. I might have to call Siemens if I don't come up with something.

 

[kevin906]

This sounds a loop start/ground start mismatch. With loop start lines there is no tip ground presented to make the PBX aware of the trunk seizure. Only when ring generator is present does the system allow for answering. Verify the type of trunk with a butt-set and adjust the trunk parameters accordingly.

 

[phonetech1]

I also have a loop start trunk group. I have the same thing there as well. I'll verify polarity and trunk type again and post an update.

 

[donb01]

One more question based on Kevin's comments. Was this a new or a replacement PBX when it was installed? What I'm wondering is if this was a new PBX and you ordered Loop Start trunks to connect to it and the phone company screwed up and gave you ground starts (or vice versa). If there was a PBX prior to this one and everything worked right that's probably not the issue, but if these are new trunks it may not be a bad idea to hook a buttset up to them as suggested. If you flip the switch and get dial tone they are probably loop start. If you flip the switch and then need to ground one of the wires to a ground point to get the dial tone they are probably ground start.

Hooking the buttset to the trunk itself and then calling it from another phone would also help you find out if the problem is in the trunk or the PBX settings.

 

[phonetech1]

Thanks donb01.
I've done all this already. I am an old phoneman.
21 years with Siemens. Was laidoff in 2003.
Now I manage a PBX lab with 38 systems including 4000.
I am not trained on it and it is different from Hicom 300.

 

[phonetech1]

Problem solved.
Siemens TAC fixed it. It was a timer problem.
I've noticed that after I've loaded recommended COT & COP,
the ringing interval had changed.
I'll sees if I can find out what timer it was.