Patent ID: 8483699

Claim:
A method comprising: receiving, by a radio access network (RAN) device, a call setup request from a wireless communication device (WCD) seeking to set up a call; determining that a wireless coverage area serving the WCD has a historical roaming rate that is above a roaming rate threshold, wherein the wireless coverage area is operated by a service provider, and wherein the historical roaming rate represents how frequently, in the past, WCDs served by the wireless coverage area roamed from the wireless coverage area to wireless coverage areas operated by other service providers; in response to receiving the call setup request from the WCD, the RAN device determining that (i) the WCD is configured to conduct the call using either a first codec or a second codec, (ii) the first codec supports using a sampling rate of over 8,000 Hz, and (iii) the second codec uses sampling rates of 8,000 Hz or less; and based at least on (i) the WCD being configured to conduct the call using either the first codec or the second codec, (ii) the first codec supporting using the sampling rate of over 8,000 Hz, (iii) the second codec using sampling rates of 8,000 Hz or less, and (iv) the historical roaming rate being above the roaming rate threshold, the RAN device instructing the WCD to set up the call using the second codec.