AASTRA DT4x2 for MD Evolution User Guide EN - Manual (Page 46)

Outgoing Calls, Busy/No-Answer
MD Evolution – Cordless DT412 / DT422 / DT432 46
Call in Substitution or with Signature
You can also place an external call in substitution or with signature.
This concerns the exceptional use of a third party set, to place an
external call, just as if you were using your own extension.
The main advantage of this feature is that the call is charged to your
own extension. Another advantage is that on the substituted third
party set, you have all of your extension's customary services,
most especially dialling discriminations relating to various external
numbers applicable for your extension.
This service is valid on a call-by-call basis. It is automatically
cancelled at the end of each call processed using this service. 75
Dial the prefix "75", to access to the call in substitution
service.
å
Then dial your own extension number.
This is necessary in order to sign on to the third party set. æ
Press.
å
Next, dial your user password.
By default, your user password is “1234”, however you may have
modified it. (See section “ Password Programming ” on page 110). æ
Press in order to terminate access to this service.
You may now proceed with placing your external call in substitution
from the previous extension. å
Simply dial the desired external number.
You may do so according to any of the methods available on this
extension for dialling an external number. Your call is then
established normally. æ
Press to make the call