i would start looking at your IP connectivity between the agent phone and your client.
"robotic" voice is sign of packets dropping out of jitter buffer so my guess is you are running your call center on top of a best effort data network.

try configure QoS on your network.

T.

On 13 December 2016 at 10:29, Babak Yakhchali <babak.freeswitch@gmail.com> wrote:
Hi
We are using freeswitch for our callcenter. Sometimes agents complain that when the call is connected to them voice is robotic and after they hold the call for some seconds quality becomes ok! how can I troubleshoot such a problem. all agents are using cisco 7941, 7942 or cisco ipcommunicator


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