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Wired Networks Thread, VOIP - full IP system or hybrid? in Technical; Originally Posted by twin--turbo We have a PSTN of the phone system for total emergancies, and a failback to ISDN2 ...
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    Quote Originally Posted by twin--turbo View Post
    We have a PSTN of the phone system for total emergancies, and a failback to ISDN2 if there is a problem on the ISDN30. If we move to SIP we would retain the ISDN2 and certainly keep a stand alone PSTN unit.

    Rob
    Just my bit but i'd recommend you look for a SIP / leased line provider that can provider guaranteed QOS or a dedicated VLAN across their network back to the SIP softswitch. I've seen a lot of SIP trunks simply not work correctly because there's no guaranteed VoIP prioritisation over the network. Don't get me wrong SIP will work 99% of the time but users will always shout and remember that 1% of time when it doesn't!

    Ref 999; I'd need to double check but I think Ofcom made it a legal requirement about a year ago that if you deliver outbound calls over SIP if the provider is in the UK then they're supposed to offer breakout to 999 emergency services.

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    Anybody know any way to contact the folks at Avaya, I'm looking to get some quotes! Tried there email on the website and it seems to not work!

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    PM'd mate

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