1. A computer-implemented method of determining channel utilization in a gateway, comprising: retrieving voice call entries from a database associated with the gateway, wherein the voice call entries correspond to voice calls handled by the gateway; determining, for each voice call entry, whether a gateway channel was used during a voice call; determining, by a processor, for a voice call entry, for which a gateway channel was used, whether the voice call is complete or active; if the voice call is complete, determining channel name used in the voice call and channel usage duration of the voice call since last channel utilization determination; mapping the channel name with the channel usage duration and storing the mapping in the database; if the voice call is active, determining channel name used in the voice call and channel usage duration of the voice call since last channel utilization determination; and mapping the channel name with the channel usage duration and storing the mapping in the database.