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You may take a look at this document, might help. http://www.cisco.com/en/US/products/hw/univgate/ps501/products_implementation_design_guide_chapter09186a00800eaafd.html
You will have to put the following of commands in voice-port - FXO :voice-port X/X/X cptone BR timeouts call-disconnect 3 timeouts wait-release 3 supervisory disconnect dualtone mid-call supervisory answer dualtoneHope this helpsJoao Aranda
