I have a Customer who has the following issue.
The Customer has a range of DDI numbers which come into a Voice Gateway configured with a 1x 30ch Pri-Rate E1.
There is an intermittent fault whereby the Incoming Call Alerting continues to ring on the B-Channel for at least 40 seconds before the contact center
Route Point processes the call. The call center has a maximun of 50 Jtapi CTI Ports and during the busy period there are at least 7 call center agents and possibly 4/5 of those agents handling calls. The Customer's IPCC-Ex is not a busy system.
There is no pattern to the long ring duration i.e the Contact Center Route points will process half a dozen calls after a single burst of ringing then the next call will continue to alert for 40 seconds before the Contact center process the Call.
The IPCC-Ex is running 4.5(2) SR02_Build014, which is the latest release. The SR was installed about a month ago because the customer had issues with calls disconnecting. The Cct has been tested by the Telco and appears to be ok. there are no errors on the E1 controller and the debug shows the incoming call Alerting and call setup. The CPU Process of the Gateway is < 10%.
The only thing I can think of trying next is swapping the E1 cct. The Customer has a 2nd cct with the Telco which is in place for resilience and is not being used.
any suggestions welcome