5.36.5.3. VNR with Alternate Routing on Error (ARoE) 
The parts of ARoE that have relevance for VNR include scenarios for
AP Emergency or HFA Alternate Logon.
In these cases, there is usually an entire group of stations from
specific areas (APs) in a OpenScape 4000 that cannot be reached.
To avoid having to configure alternative station numbers for each
individual station (storage space), you can use the AMO APRT to configure
a partially qualified alternative station number for an entire source
group and then append this number with the station number you want to
use.
This number appended always includes the node code.
When performing administration with the AMO APRT, ensure that the
parameter that defines the maximum length of the station number you want
to expand is sufficiently large so as to accommodate the length of station
numbers and virtual node numbers in the case of different station number
lengths.
OpenScape 4000 supports length specifications that exceed the actual
station number generated. If the station number generated exceeds the
length specified, this number is truncated from the left.
You can use this mechanism when an HFA telephone tries by mistake
to log on to a non-NUN node in which its station number is configured
without node code.
GUI impact
- Consider VNR relevance when configuring the alternate routing number with APRT or SDAT.
- If the alternate routing number is configured as partially qualified (only possible with the AMO APRT), you should specify a length that will accommodate the station number to be generated.
- If the alternate routing number is completely configured, check whether it must be administered with the node code.