Derived trunk in same tenant where the parent trunk is registered

[SimranDhillon]

I'd like to find out if it should be possible to use derived trunks in the same tenant in which the parent trunk is configured.

My configuration looks like the below:

• Parent trunk `teamstest.carrier.com` is configured in TAC and connected to a working SBC. The trunk is showing healthy with no issues reported.
• Base domain and subdomains have been registered in M365, in the same tenant:
  • `teamstest.carrier.com`
  • `account001.teamstest.carrier.com`
  • `account002.teamstest.carrier.com`

I am able to create voice routes which use `teamstest.carrier.com` but when I try to create voice routes using the derived trunk, e.g.:

New-CsOnlineVoiceRoute -Identity Route1 -OnlinePstnUsages @{add="Account1Record"} -OnlinePstnGatewayList @{add="account001.teamstest.carrier.com"} -NumberPattern ".*"

It fails with the error:

New-CsOnlineVoiceRoute: Cannot find specified Gateway "account001.teamstest.carrier.com".

Is this because I have some incorrect configuration, or is using derived trunks in this manner not supported?

[#2]

Hi @SimranDhillon ,

I'm not sure if it works also in the same Tenant.

But the derived trunk setup works for different tenants. Look at the Microsoft learn article describing a hosted SBC model for a carrier setup.

Best regards,

Thorsten