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Porting over phone number to another circuit

I have a customer who has a bank of 300 phones numbers that come in via SIP trunks over a 50Mbps Comcast Cable circuit.  I am going  to install Cisco CME and Unity Connection for a portion of the business.  Their old phone system will service another entity in the business that is less critical.   So I have to split up these 300 phones numbers to put about 1/2 of them on the new system.
On their data network, they have a Comcast enterprise fiber circuit they just installed, its a lot more reliable then the cable modem they use to bring in the SIP trunks now, and the SLA is way better.  So for the portion of the business I am installing the Cisco VOIP in, I want to know if its possible to port over 150 phone numbers from the bank of 300 they have from the current Comcast cable modem to the Comcast enterprise fiber.  Meaning I want to split them up so I have a 150 on the cable modem for the old less critical system, and 150 on the fiber.  Its the same provider, just different circuits.  I just want to know if this is possible.  Thanks!
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sure, you will just be adding a new sip trunk on your fiber network, i would port all of them if it were me.  You will have to talk to Comcast, but you could probably have a trunk on each, and failover as needed too.

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Thanks.  So half the numbers will remain the on the Comcast cable, because another business entity will be taking over the old phone system.  We just want to port over the numbers that will be used for the new phone system for by this entity.  Basically what happened is the business broke into two separate business's, which is why we are breaking it up like this.  So I know I need to call Comcast, but this should be no problem right?
correct, the porting will not be a problem, you just need a new trunk on the fiber to port to