Trunk Auto Impedance matching causing issues with Door controller

[bobertb]

We know that as soon as you plug a analog trunk into an IPO PORT the trunk port tries determine the line characteristics by sending out all kinds of tones etc on the line before it actually goes idle.

Here's my problem.
I'm migrating a Viking C2000 Advanced Door Entry Controller from a Partner.

When connected to IPO,this is what happens:
o Press button on door phone
o The Viking rings in on IPO trunk and alerts a Hunt Group
o User answers call and hits ### to unlock door at which time the Viking disconnects.
O All good

Now the problem:
o If you press the door phone button again within up to about 20 seconds of first call....you hear (atthe door phone) the IPO doing testing on the trunk.
o The call doesn't ring thru to the IPO and everything's in a state of confusion.
o If you do NOT push the door phone button to soon, everything normals up and the next call works fine...because the IPO has had time to reset its Trunk Port

So.....can this situation be avoided in any way?

 

[amriddle01]

Can't it be set to use an analogue station as oppose to trunk? That's the "usual" way to do it

 

[critchey]

Correct me if I am wrong (happens often) but you can just turn off the automatic for impedance and set the impedance manually.

 

[Telecomboy]

You can indeed. And on a line by line basis so just uncheck it for the line you are working with and if that is what is causing the issue it will go away.

 

[critchey]

Oops ya I meant to say turn off automatic for that specific line. Should fix your issue.