@jhelou wrote:
Hello Community,
I am having a strange problem with a deployment of FreePBX 13.0.190.7
i have 20+ Aastra 6731i and one Cisco 508G, the aastra phones create a distorted echo only audible by the person who is talking on the phone, and only echo the person's own voice. the receiving party does not hear the echo and it is not audible on recordings, on speaker phone the problem seems to be less pronounced. Cisco phones had no problems at first but today they too have some distorted feedback. the problem is more pronounced for external calls, and it builds up over time for long conversations. I tried replacing the handset, the phone, the codecs used (i tried g711 and g722). I also tried settings: handset tx gain: -10 in the provisioning file (aastra phones). The gain parameter helped a little but the distortion is still audible and annoying.
I have exhausted the limits of my asterisk knowledge, i was thinking of replacing the catalyst PoE switch, but i don't see how this could affect call quality. any ideas would be greatly appreciated.
Thank you
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