Teams Direct Routing Extension Transfer Failed

HiAdityo Prabhaswara H. 

As suggested by DaveChomi , do the below.

. Add Normalization rule in as per your extension and set internal extension as "False".

With required PSTN usage (default Global) and route.

Then in SBC, route it back to Teams with Full E164 Format. It is workaround to reach back teams by extension. You have to create calling number / called number rule for the same as well.

Audio code or RIbbon?

Find below example

User Dial Plan : "User Dial Plan"

Create the normalization rules for your extensions.

$NR1=New-CsVoiceNormalizationRule -identity Global/User Dial Plan -description “Extension” -pattern ‘^8(\d{3})$’ -Translation ‘8$1’ -InMemory -IsInternalExtension $false

8XXX is my extenson here

Add Normalization rule globally

Set-CsTenantDialPlan -identity Global/User Dial Plan -normalizationrules @{Add=$NR1}

Set-CsOnlinePstnUsage -Identity Global -Usage @{Add="Extension"}

New-CsOnlineVoiceRoute -Identity "Extension" -NumberPattern ".*" -OnlinePstnGatewayList <sbc_domain> -Priority 1 -OnlinePstnUsages "Extension"

Assign permission to ur voice policy

Set-CsOnlineVoiceRoutingPolicy -Identity "Local" -OnlinePstnUsages @{Add="Extension"}

Set-CsOnlineVoiceRoutingPolicy -Identity "National" -OnlinePstnUsages @{Add="Extension"}

Set-CsOnlineVoiceRoutingPolicy -Identity "International" -OnlinePstnUsages @{Add="Extension"}