Currently i have a CVP 7.0(2) es 22 and CUCM 7.5(8), I noticed that sometimes Calls routed to agent are getting dropped, and on the Ingress Gateway i'm watching disconnections because of User Busy (some show commands are attached).
Call flow is simple:
Ingress GW -> CallServer ->Agent if ready, if not then queue.
On CVP i'm getting this error very frequently
%CVP_7_0_SIP-3-SIP_CALL_ERROR: CALLGUID = 94573CAB628C11DF8EEB8D236821F970 LEGID = 9459ADE3-628C11DF-8EF08D23-6821F970 - [INBOUND] - DIALOGUE_FAILURE from ICM Router sends 500 rejection to call. [id:5004]
So i think that once the call is getting routed to the agent the call disconnects by whatever reason, but that whatever reason is what I'm unable to find.
This happens just sometimes, I've seen this error before, when the Device Target does not have a label or when SIP trunk have incorrect CSS on the configurations. But on all those cases happens on all calls or exact extensions... this time happens randomly some calls complete on agent and some calls not.
Any experience on issues like this one will be appreciated.