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> Does Hylafax support DID (assuming the modem does, etc)? I don't think it does, but then there are no modems in the UK with special support for DID as DID is only available over digital trunks as non channel associated signalling. I'm surprised that there is any significant market for them in the USA. Are they used to simulate multiple lines on one physical line, or does the PABX route the DID digits forwards to the extensions? In the latter case, is there really a national standard for such signalling? The only people I've heard of doing similar things with ISDN multiple subscriber numbers are code hackers (in the nice sense) and have done their own software - I don't think the one I'm thinking of uses Hyalfax.