This attribute specifies the number of digits that must be received
before an address resolution request will be sent to the
VoiceNetworkingCallServer. Once this level has been exceeded an
address resolution request will be sent for every digit received until
the dialled number has been resolved in the database.
This number should be set to a value which represents the average
number of digits that will allow for a unique end-point to be
identified. If the number is set too low, then the number of
simultaneous calls that can be handled by the
VoiceNetworkingCallServer will be reduced since the number of
address resolution requests sent for each call will be increased. If it
is set too high then address resolution request messages will not be
sent to the VoiceNetworkingCallServer until the end-of-dial timer
has expired (approximately 12 seconds after the last digit has been
received). This can result in very long call setup times.