Each day, millions of calls transfer seamlessly from VoIP to landline phone systems. But how do the two technologies connect? Here’s how the process works.
point (Czernich, 2014) and the availability of the current Digital Subscriber Line (Denzer et al., 2021), are usually constructed based on the contemporary information. Recently, Huang et al. (2019) creatively used past information on the number of landline telephones as an IV for the ...