Transfer Attempt Warning Event ID 1155

Question

Does anyone have any idea why I keep getting warnings such as the one below? I have checked all of the restriction tables but everything looks good. Any ideas?
Event Type: Warning
Event Source: CiscoUnity_ConvSub
Event Category: (14)
Event ID: 1155
Date: 2/25/2009
Time: 1:42:31 PM
User: N/A
Computer: UNITY
Description:
Transfer attempt for Call Handler: SA(extension: 2803) failed on port 5. Possible reason could be the dial plan on the phone system does not allow this dial string: 2803. The dial string used was taken from the Call Handler's Contact Rule: 'Standard'.

Answer 1

Does this seem to happen only for calls that are transfered to an ACD group?
If you can narrow it down to a specific call handler or notice that it is happening very frequently for a specific call handler, try adding a comma or two to the dial string to see if this reduces or eliminates the problem.
This is definitely shooting at the hip type troubleshooting, but many integration issues like this are timing related. There is a post-dial delay setting in UTIM but this would affect every call for that telephone integration. So adding a call to a particular call handlers dial string is less intrusive at this point in the game.