I just finished configuring a CUCM 7.1.3 system.
When I dial the MWI on number from a set, there is a long pause before the MWI
on the phone turns on. Same thing when dialing the off code. On both my 6.1 system and my 3.3
system the lamp on / off is almost immediate. Places to look for the cause of the long pause?
You'll need to look for an overlapping number in the 51xx range. This sounds like
you are seeing the inter-digit timeout kicking into play here