When a CIPC receives an incoming call, let say I am calling from cell phone to CIPC user, when the call get connect, for the first 4 to 5 seconds CIPC user can not hear anything, but I can hear them clearly, so there was a one way audio/delay for the first 5 seconds, after this both party able to hear. It is not occurring on all calls.
We able to duplicate this on a inbound call only, not sure whether its happening on outbound too.
Tried with Both CIPC 7.0 and 8.6, also it happens regardless how the CIPC is connected i.e., local LAN or VPN.
It’s a difficult one. I've experienced something similar before, but with hard phones and in my case it was a QOS issue. The CUCM and phones were on different sites. Might be you should check the LAN for any packet loss and eventually check the QOS settings on LAN. Also check the Cisco bug tool for any defects with the CUCM version you are running.
You might want to contact TAC as a last option, if you are not able to find the cause of the problem and the impact to your business is great.
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