Peering with 2 different SIP providers on the same physical interface?

Hello..we currently have peering with a single SIP service provider. We are using private IP addressing on the peering interface/s (8 net-net devices in total). Anyway for simplicity, lets imagine we have a single SBC peering with a provider A using private IP addressing (private MPLS VPN).

 

Acme (10.x.x.x) ------>private MPLS backbone-------> provider A

 

can i use the same interface for peering with another provider B which requires public IP addressing schema? Is 802.1Q trunking an option here? if possible what would the sample config look like?

 

Thanks