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Automatic Speaker Verification (ASV) is a challenging task over the mobile/IP based system as the coding introduces some loss in system performance. This paper reports on the work in progress to examine the impact of GSM-AMR codec used in mobile at its various bit rates and G.729 codec for VoIP, along with different kind of noise and packet loss scenario for the speech signal. PURE YOHO database has been used for the evaluation of this task. Respective encoder and decoders are used back to back on wideband clean microphone speech to simulate the real-life situation. Evaluation of performance is done through the measurement of Equal Error Rate (EER). It has been shown that the loss due to GSM-AMR codec is very significant for speaker verification compared to undecoded speech. Though the packet loss and bit rate may degrade the quality of speech but it is not significant to detection of speaker's identity.