Dial tone heard when answering a call.

[norm.trees]

Hi,

Hope you can help.

I have a Cisco Callmanager 7.1.3 cluster. We have an intermittant fault wherein when answering a call on a 7940G phone, the called party hears a dial tone during the call but the caller does not.

The phones have been upgraded to use P00308010200 firmware. The problem still exists.

Any suggestions would be great.

N.

[dfokin]

I have met once this problem. The phone with this problem was in a remote site and CUCM server was at the central site. The cause of the problem was unreliable link between HO and remote site without QoS support. Some packets were dropped or lost in transit -- so the pone did not received a "StopTone" SCCP message. After implementing QoS on the link and increasing bandwidth between sites the problem disappeared.