You should indeed use CTR4 with R2 signalling. I'm not sure why you are asking about an ISA setting on a PCI card. If the Dialogic Configuration Manager is configured to use that protocol for the card, it should work regardless of the type of bus. <br> <br>I believe your last question concerns the DNIS. Of course, you should use the DNIS field in the Wait for Call step. *But*, if you absolutely need to know the subnumber (as defined in the ISDN specifications), then we need to provide you an upgrade at some point. Could you please clarify what he means by "subnumber"? Is this the same as what we call a DID in North America? If not, can you create the service you wants using that model?