How does Twilio manage concurrent inbound and outbound calls in these scenarios:

1. Main account with a single phone number.
2. Main account with a multiple phone numbers.
3. Subaccount with a single phone number.
4. Multiple subaccounts sharing the same phone number.
5. Multiple subaccounts with Multiple phone numbers.

Looking for details on call routing, concurrency,Latency and any limitations. Examples or best practices would be helpful!

@twilio @inboundcalls @outboundcalls @SubAccounts @concurrency