You need to have some type of trunking between the two platforms. This can be either SIP trunks, QSig trunks or straight PRI. You would need ARS ( automatic route selection ) programming to route the calls between the different phone systems. It will not matter if one system uses 4 digital extension numbers and the other 5.
I'd tell you a UDP joke but I'm afraid you won't get it. TCP jokes are the best because you always get them.
dependant on what you are looking to achieve / the hardware you have .... if all users are on the same site you could use a netvitesse gateway to register the cisco phones as SIP devices with the 3300.
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