AUDIO QUALITY ISSUES - Help please!

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Hi,
I am using PJSIP.
I am experiencing the following problem.
When I make a call I can hear the recipient clearly without any problem at all. However the recipient of the call cannot hear me clearly.
Voice breaks every few seconds. So for example if I say the the following:
?"Once upon a time there was a little girl who went to school" the recipient will here "Once upon ...... time there....... to school"?The ...... depicts loss of audio.
I have made over 30 test calls from 3 different Android devices using both Wifi and standard 3g data. The result is always the same.
I am using the following settings:
Echo cancellation (Active)Clock Rate (Auto)Media Thread Count 2Codec priority list per bandwidth is active:Codecs - FAST ?PCMU 8kHz, PCMA 8kHz, SILK 24 kHzCodecs - SLOW SILK 8KHZ, GSM 8kHz, PCMU 8kHz, PCMA 8kHz

Please can somebody help and tell me how to configure things properly?
Thanks in advance.
GQ


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