SAP Message BCOMEC033 - The extension &1 to which the call is to be transferred is not permitted

Diagnosis
You want to deflect a call to the connection &V1&. This is notallowed. Possible reasons:
1. The telephone number is not valid
2. Incoming calls cannot be deflected to this connection without firstbeing accepted.
Further information on the external software component:
V3

System Response
The call is not deflected. It still exists on your connection.

Procedure
Choose a different number. If the required number is not offered, youcan either assign yourself a different number group in the
user-dependent settings of SAPphone or ask yoursystem administrator to insert a new number in your number group.

Procedure for System Administration
In order to insert a new number in a number group, start the SAPphone
system administration and choose 'Goto -> Deflect ->Maintain numbers' in order to create a new number, and 'Goto -> Deflect-> Maintain groups' in order to add the number to a group.
The error can occur in 2 different places:
1. In the connected gateway
2. In the underlying CTI software
In this case the error occurred in (&V4&).
The return code for the underlying CTI software is: &V2&