Hi,
Both BBB and a call center needs a separate bare metal server. the call center software needs a hardware and lines to manage, so where do you want to implement?
I can do both servers configurations and full customisations, but they are too much far from the suggested budget, you should expect them to be around $6000, plus bare metal servers, then they could be integrated into other systems like WordPress.
If this is serious enough, please let me know.
Regards,