[cisco-voip] Multi-tenant Model for SIP trunking

[Ki Wi]

Hi Group,
what's the best approach for providing multi-tenant model?

The scenario is the building owner will subscribe all the ISDN
numbers/circuits.
The tenant within the same building must subscribe the telephone service
from them.

What's the recommended setup?

Example :
CUCM + ISDN VG to connect to ISDN/SIP trunk with the provider. (Backend)

At the tenant side,
1)  VG (with CUBE function) at respective tenant.

Let's say the tenant have their own IP PBX with their own subnet addressing
scheme. The intention is to place a VG with 1 LAN connection to the
tenant's subnet and 1 LAN connection to the building owner's subnet.
Performing the SIP NAT-ing.

2) VG without CUBE , converting to E1 connection for non-IP PBX or IP PBX
with incompatible SIP/h.323 signaling issues.

Is there a better way to save on software/hardware? Like having CUBE over
at the building owner's backend? The only worry is the NAT-ing part when
the tender prefer to stick to their own IP addressing scheme.

Non-cisco setup is welcome!

-- 
Regards,
Ki Wi
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