I am working on a case about Teams direct routing hosting model. After going through the article about 'Configure a Session Border Controller for multiple tenants'https://docs.microsoft.com/en-us/microsoftteams/direct-routing-sbc-multiple-tenantsI found the part describing the derived trunk from customer tenant to carrier's tenant confusing. Quoting from the article' Sbc1.customers.adatum.biz – the derived trunk in a customer tenant that does not need to be created in PowerShell. You can simply add the name of the derived trunk in the customer tenant in the online voice routing policy without creating it.' Does anyone have experiences on similar cases and can kindly provide me with some suggestions on how to configure the derived trunk?Thank you so much.

fanzhangrob the documentation still needs a bit of work, but the derived trunk model works as expected.In the carrier tenant, you just need to ensure TLS & SIP Options are active/working in both directions (can be viewed via the Admin center) Once active, the following needs to be done:1. Register a customer sub-domain of the carrier trunk FQDN in the customer's 365 tenant (EG: Sbc1.customers.adatum.biz where Sbc1 is the customer subdomain)2. Create the voice routes & add these to a voice routing policy in the customer's teams tenantAs long as the subdomain is added to the customer's tenant and verified, S4Bonline powershell will allow the FQDN to be added to the voice route.There's no need to use New-CSOnlinePSTNGateway.

Hi Vasileios_T, Before you can add the Voice Routes, you need to add the tenant-specific sub-domain to the customer's Office 365 tenant, as an additional domain.EG:Carrier: hosted.example.comCust 1: cust1.hosted.example.com Once you've added the sub-domain for the customer & added the TXT record to the carrier's DNS to authorise the sub-domain addition, you then create a dummy user within the new domain, with a S4B Online license at least.EG:test.user@cust1.hosted.example.com - licensed with E3/E5 etc. The license only needs to be assigned for 30/60 minutes while the platform activates the domain. Following this, you should then be able to create the voice routes etc. as you've attempted.

TeamsDR I tested assigning the license and removed the license after seeing the FQDN in the result of Get-CsTenant | fl Domain*It works fine

Any information about this?Tried to understand how to configure an derived trunk but cannot find any solution to get it working. The doc says you dont need powershell for a derived trunk, so i belive there is a option on either the teams admin center or directly on the carrier partner portal for our costumers.Also considering the doc it says'the derived trunk in a customer tenant that does not need to be created in PowerShell. You can simply add the name of the derived trunk in the customer tenant in the online voice routing policy without creating it'So i have tried to add our carrier trunks FQDN to the Voice Route but either Set-CsOnlineVoiceRoutingPolicy and Set-CsOnlineVoiceRoute fails that they cant find the PSTN Usage or PSTN.

ElmarNiederkofler Thanks for the reply. I really hope someone has some idea of how to get it work.I am guessing that this solution is no available for now but somehow there's an article talking about the future. 1. As you said set-csonlinevoiceroutingpolicy is not an option.2. I cannot see a way to tell the carrier tenant to route the signaling from the customer tenants to the SBC or push the trunk setting to the derived trunks. For now I'm using the old school way which is new-csonlinepstngateway at every customer tenants. At least it works.

Derived Trunk for Teams direct routing hosting model

ElmarNiederkofler
Copper Contributor
Sep 27, 2019
Any information about this?

Tried to understand how to configure an derived trunk but cannot find any solution to get it working. The doc says you dont need powershell for a derived trunk, so i belive there is a option on either the teams admin center or directly on the carrier partner portal for our costumers.

Also considering the doc it says
'the derived trunk in a customer tenant that does not need to be created in PowerShell. You can simply add the name of the derived trunk in the customer tenant in the online voice routing policy without creating it'

So i have tried to add our carrier trunks FQDN to the Voice Route but either Set-CsOnlineVoiceRoutingPolicy and Set-CsOnlineVoiceRoute fails that they cant find the PSTN Usage or PSTN.
- fanzhangrob
  Copper Contributor
  Sep 27, 2019
  ElmarNiederkofler Thanks for the reply. I really hope someone has some idea of how to get it work.
  I am guessing that this solution is no available for now but somehow there's an article talking about the future.
  1. As you said set-csonlinevoiceroutingpolicy is not an option.
  2. I cannot see a way to tell the carrier tenant to route the signaling from the customer tenants to the SBC or push the trunk setting to the derived trunks.
  
  For now I'm using the old school way which is new-csonlinepstngateway at every customer tenants. At least it works.
  - swerner
    Copper Contributor
    Oct 02, 2019
    fanzhangrob the documentation still needs a bit of work, but the derived trunk model works as expected.
    In the carrier tenant, you just need to ensure TLS & SIP Options are active/working in both directions (can be viewed via the Admin center)
    
    Once active, the following needs to be done:
    1. Register a customer sub-domain of the carrier trunk FQDN in the customer's 365 tenant (EG: Sbc1.customers.adatum.biz where Sbc1 is the customer subdomain)
    2. Create the voice routes & add these to a voice routing policy in the customer's teams tenant
    As long as the subdomain is added to the customer's tenant and verified, S4Bonline powershell will allow the FQDN to be added to the voice route.
    There's no need to use New-CSOnlinePSTNGateway.

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Derived Trunk for Teams direct routing hosting model

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