IP Conference telephone

We have a Siemens Hipath 3500 exchange with several optipoint telephones.

We have been using an analogue VTX1000 for conferencing but it is unreliable for setting up 4 way calls despite the Hipath having the current firmware.

Should we look at an IP conference call, and if so, what model or will something like these Konftel units,50 or 60W, attached to a basic IP phone work well?

Thanks for any help,
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That will work - the problem is that to make multiple party calls using an analogue extension you have to have properly timed flash intervals, a unit that does not send false disconnects, and a telephone switch that is enabled for multiple calls on analog (some only do multi-party with a conference card or with IP phones).  

You may also want to compare to the units from these folks:
Very high quality (our clients often use them in executive conference rooms even when they have other units in smaller rooms) and they can bypass the need for the IP phone.  However, with the Siemens switch, you will need to operate it in basic SIP mode since they are not a full interoperability partner.

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Are you sure your Siemens system supports more than three party conference calling?  I checked my quick resources and cannot confirm that the 3500 does.  I can check further if needed, but if you can setup 4-way calls with the Optipoint phones you are probably good.
Dr. KlahnPrincipal Software EngineerCommented:
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IP Telephony

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