The UC560 comes with 8 DSP's capable of 16 g711 channels (128 total on the system) or 8 g729 channels each. Keep in mind the FXO and E1 ports are not the only features sharing the DSP resources, conferencing and codec translation use these as well.
Have a look at the platform reference guide below, it has quite a detailed breakdown of DSP resource utilization and scenarios:
Simply put the 560 will handle all of what you are asking for, plus much more... It us quite a powerful system with quite a fair bit of resources.
You have nothing to worry about
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