How can H248-based media control and service-based media control coexist?
There is no coexistence between H248 and SBI for media control
A control plane NE can only support either H248 or SBI
H248-based media control is deprecated in favor of service-based media control
A control plane NE can choose between H248 or SBI for media control
Only certain IMS entities can support H248-based media control