Cheng-Suan Lee and Khong Neng Choong and So Gean Koh and Chee Onn Chow and Mazlan Abbas, Performance Study on Audio Codec and Session Transfer of Open Source VoIP applications. journal = {International Journal of Information and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2009, vol. 36(12). 2281 - 2287 [viewed 23 September 2024]. Available from: https://publications.waset.org/pdf/3154.