Lync 2013 as PSTN gateway for CUCM

Hello,
this is an oddity and not really an advertised feature with Lync, but:
we have a really small footprint of CUCM devices, mostly VTC units that would like to be able to call out to PSTN using Lync infrastracture. We have a fully featured deployment of Lync 2013 used company wide 2000+ users.
We created a SIP trunk between CUCM & Lync mediation server, we defined New IP/PSTN Gateway in topology and published it, configured SIP trunk, profiles, etc in CUCM. The purpose of this is to only dial outbound from the CUCM devices, the CUCM devices
do not have to be reached from outside or by Lync users.
We are able to place calls from a VTC endpoint registered to CUCM via Lync SIP trunk to all Lync users, but we are unable to dial out to PSTN.
Most configuration refer to configuring Lync to use CUCM for PSTN connectivity not viceversa. Is there any documentation on achieving this?
Call flow would be like this.
VTC Endpoint > CUCM ----SIP Trunk----> Lync mediation > PSTN
We already have PSTN access built in Lync, we just need to bridge between the CUCM direct SIP trunk and PSTN.
Thank you.

Hi,
To enable inter-trunk routing, associate and configure PSTN usage records to this trunk configuration. The PSTN usages associated to this trunk configuration will be applied for all incoming calls through the trunk that is not originating from a Lync endpoint.
More details:
https://technet.microsoft.com/en-us/library/gg425831.aspx
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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