Using the ISDNLink, there is no way for it to tell whether you want to call H.323/H.320/SIP unless you tell it to - it will revert to your Default Call Protocol unless you specify otherwise.
If you were using a more centralised ISDN gateway for your environment (like a 3241 gateway), you can then use rules to detect different prefixes or suffixes to route certain things to the ISDN as voice only.
Your best bet is likely to be to set the default call type to the type of call that is dialled the most from the unit, and then manage the other manually (ie, if more phone / ISDN calls are done, set H.320 as the default call type).
/Wayne
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Wayne
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