sundance-communications.com/forum Forums TDM Business Telephone Systems Inter-Tel Telephones & Systems insufficient bandwidth

Fantastic information. Our network guy is on it.

Will this need to be done on all nodes and IP endpoints?

Yup.

There is also a software bug that I have ran into between a 5000 and an Axxess. It may or may not relate to this situation but I posted the notes I have:


The Axxess IPRC has an unsupported fax pass-through mode for IP private networking. In this mode, the IPRC detects a fax tone and switches the encoding to G.711. The IT-5000 uses T.38 for fax-transmission for IP private networking. These methods are not compatible. Attempting to use them together will result in Insufficient Bandwidth Alarms and one-way or no audio.

There is also a bug in some Axxess versions that sets the Fax Detection Sensitivity to 1 when it is programmed to 0 (off, the default) in the database. This causes frequent erroneous Insufficient Bandwidth alarms to occur.

In Axxess, the settings are in OLM mode under Node IP Connection Groups-P8xxx-IP Call Configuration.

There is a chance of false fax detection when the Fax Detection Sensitivity level is set to a low value. It seems common for the sensitivity level to be set to 1 (10 ms) which will result in frequent false detections.

When networking Axxess and IT-5000 nodes, both sides should have fax detection maximized - As a precaution to avoid the known Axxess bug, set the Fax Detection Sensitivity to a value of 100 (100 is maximum) on all Node IP Connection Groups (P8xxx) on both the Axxess and IT-5000 nodes.
NOTE - IT5000 to IT-5000 or Axxess to Axxess, this does not need to be set.

Examine the Network Diagnostics Log (.ndl) on both systems for a good indication that this is happening. This log shows Insufficient Bandwidth Alarms. If one system has the majority of the alarms, there is a good chance that the opposite node has incorrect fax settings.

This only applies to IP private networking calls with a combination of IPRCs and IT-5000s. Insufficient Bandwidth Alarms on IP endpoint, Axxess-only, or IT-5000-only calls probably have another cause.

Awesome post! This is why I subscribe to this group. The Axxess was already set to 100. The two 5000s were set to 0. I'm only having this problem with one of the nodes. It happened over the weekend and this morning. I've made the changes. Hopefully it will take care of the issue.

So far, so good. No drops to report.

Two more weeks have gone by with no problems. Thank you.

I know this is an old post but just wondering how or where you generated those reports? We just had a insufficient bandwidth message on one of our phones.

Appear to be from 'System Freeze' logs, 'Message Print'.

I've been having similar problems with Insufficient Bandwidth alarms that we can't explain, so I'm willing to try the fax detection settings.

Does anyone know if calls will be dropped when the values are changed? I know that IPRCs sometimes reset during programming.