It should work. The ASA will accept the second tunnel from the 3rd party unit, I have seen it with certain Wireless VPN Routers which can only have one SA per tunnel. My first suggestion was in case you wouldn't have a clear understanding of one tunnel and multiple SAs, but your 3rd party needs to build a second tunnel in order to apply specific QoS policies and I think the ASA will accept it without problems. Keep me posted. Thanks.
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