VX says VVX “Not Acceptable Here”

Protocols and standards. We live and die by them, and while we can’t live without them, sometimes they can be a royal PITA. And so it is apparently, with Polycom’s interpretation of RFC4568 Session Description Protocol (SDP), with which I became all too familiar this week. I was called in to try and figure out …

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Adding Direct Trunk Select to Skype for Business

At about the same time any given Skype for Business deployment gains its second PSTN gateway / Session Border Controller, the old diagnostician in me wants a means to be able to directly send calls to each one individually. By being able to directly focus my outgoing calls on just one SBC I can confirm …

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Event 18456 – Start-CsPool Error Failed to Connect to BackEnd

I hit an expected snag recently where I wasn’t able to get an existing SfB 2015 Front-End pool to start after growing it from 1 to 3 servers. Coincidentally I’d performed this same job for another customer maybe a month prior and it had gone off without a hitch. Not so this time. Try as …

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SfB 2015 Server Update – March 2018

Our March 2018 update nudges the server up from 6.0.9319.510 to 6.0.9319.516 and updates 7 components on my Standard Edition Front-End. It doesn’t seem to be officially called CU7, but so far Martin and I are going with that. I’ll update the post if I’m advised to the contrary. CU6 HF2 it is, thanks Tim! …

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Microsoft updates WAC/OOS pre-req’s

Getting a new Office Web Apps or Office Online Server to report “Healthy” is no mean feat, and you’ll find no shortage of blog posts with advice in that direction. Hence it was with great interest that I noticed Microsoft has recently updated the pre-req’s. (OK, it was either back in May or only last …

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WAC/OOS error: Could not read settings

I was struggling with an Office Online Server recently that didn’t want to talk to me. I was able to create the OfficeWebAppsFarm OK, but then couldn’t query it (as I wanted to check its health): PS C:\> Get-OfficeWebAppsFarm Get-OfficeWebAppsFarm : Could not read settings from WEBAPPS. The destination is unreachable. The fix was a …

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LS Audio/Video Authentication service could not be started

I returned from holidays recently to find my Skype for Business client reporting the familiar “Limited External Calling” error. A quick RDP to my Lab’s Edge server revealed stopped services and this error in the Event Log: Event Properties – Event 19005, LS Audio/Video Authentication Server LS Audio/Video Authentication service could not be started. Exception: …

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SfB 2015 Server Update CU6 – December 2017

Our December 2017 update – the first in 7 months – leaps the server from 6.0.9319.281 to 6.0.9319.510. It updates 7 components on my Standard Edition Front-End. What’s Fixed? This update enables Location-Based Routing to support the Skype for Business mobile clients. It also fixes the following issues: Kb4043636 Skype for Business on Mac can’t …

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Calls to SfB RGS drop instantly – FE logs event 31140

If you’ve ever created a Lync or Skype for Business Response Group Workflow using PowerShell you really appreciate how quick and easy it is to do from the Response Group browser interface, the “Response Group Configuration Tool”. Unfortunately sometimes the PowerShell path is unavoidable: if you have more than 4 options in an IVR menu, …

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