I have a customer who moved to their new office today. The service provider installed a new Cisco IAD2400 to provide 5 analog lines to be connected to the CIX 40. We moved the CIX from the old location.

Now when we go offhook on any line, the Cisco IAD intermittently thinks it heard a 1 dialed and breaks dialtone, waiting for more digits (even though I've dialed nothing). Previously had this problem and I told the provider to set their inputgain to 0db. But in this case it doesn't seem to affect it much or may even make it worse.

Anyone see this before or have any luck getting it sorted out?

I have had issues with Cisco 2400 in the past. Apparently Toshiba has seen these issues enough to create a KB bulletin specifically just for theses IADs.

The carrier's field tech will connect a test set to the line and tell you it's the PBX's fault and not their equipment. One of the few times I started to just about started to swear at the carrier's tech was due to problems with a Cisco 2400 to analog lines (I do it behind their backs all the time).

My issue was slightly different. Randomly as soon as we selected a line we got a busy tone from the IAD.

Have the carrier try this:

Change codec from 726 to 711

voice-port 2/0
no supervisory disconnect lcfo
output attenuation 6
no vad
music-threshold -60
caller-id enable

Change voice port settings

voice-port 2/0
no supervisory disconnect lcfo
idle-voltage low
output attenuation 6
music-threshold -60
caller-id alerting ring 2

Thanks for the reply. I had the service provider set the output attenuation to 6db and input gain to -3db, fixed the problem.