Unable to make Conference calls

[ralph]

Then it has to be related to either a setting in the system options or the COS of the phones.

Find a COS that is virgin, don't change anything and apply it to all the phones you're testing with.

Ralph

Q for the other techs:   Bad DSP maybe?

[v2win]

I know in you first post you said you checked max CO ports in a conference did you check max parties in a conference?

[petr.necas]

I would try to assign some unused COS option to all 3 sets in Station Service Assignment. I believe with default (not yet used/changed) COS it should work.

[LoopyLou]

Can anyone do it or just you because if its not interconnect or COS then I can't think why you can't do it. Are you a hot desk profile or a multidevice profile? There must be something strange in your setup.

[Dutch]

This might be a stupid question from my side and my intend is not to waste your time but just trying to think along since most other options have been discussed by others.

I don't know exactly which parameters you have checked, but do you have a feature access code programmed for:

- Conference call
- Conference call split

Under System Properties -> System Feature Settings -> Feature Access Codes

Because it seems in what you describe conferencing as a function doesn't respond at all which led me to this one.

If for some unknown reason they are empty fill them with non-conflicting entries e.g. *40 and *41 and try again.