It depends what you mean by 'splitting PRI' - can you elaborate?
Modern Cisco & Avaya systems are capable of integrating over IP or TDM, so you can deliver a single PRI to either system as and route calls on to the other system over a SIP/H323 or PRI connection if that is what you are asking.
It may also be possible to configure a H323 gateway to split calls out directly to each system.
Regards
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Aaron
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