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  1. M

    Avaya IP Office - Unable to call specific number

    Finally resolved! According to Ofcom the mobile dial code is on the O2 network but two carriers had conflicting configurations on whose network it was on. This has now been aligned correctly, and we can now call it successfully.
  2. M

    Avaya IP Office - Unable to call specific number

    Not much of an update, but an update all the same. I contacted our SIP provider, and they have said they can see the same rejection on their SIP gateways so it's something upstream of their network. So it's down to them to escalate now. I'll reply back again once I know the issue has definitely...
  3. M

    Avaya IP Office - Unable to call specific number

    I'm going to start this off by saying I have a fairly basic understanding of Avaya IPO. We currently have a strange issue where when we attempt to call a specific mobile number the phone immediately states "Number Busy". We've confirmed the number isn't busy and can call it from another phone...

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