3. The system of claim 1 , wherein the call information further includes a voiceprint of the telephone conversation, and wherein the one or more processors is configured to index the call information based on at least one stress feature identified in the voiceprint.
3. The system of claim 1 , wherein the call information further includes a voiceprint of the telephone conversation, and wherein the one or more processors is configured to index the call information based on at least one stress feature identified in the voiceprint. 6. The system of claim 3 , wherein the stored instructions configure the one or more processors to perform further operations comprising: determining the at least one stress feature for only telephone conversations having a frequency of identified keywords above a predetermined threshold.