German ISDN BRI Outbound Caller ID

We have a "Anlagenanschluss" from Vodafone 

main number is 9889 and we can use 9889-0  to 9889-9999 

(just 2 digits are needed)

We run now the 50S - nearly everything works fine- Except the outgoing caller id - it shows always 08677 98890 (first five is local area code)

configured 2 BRI trunks (4 lines) 

switch type is peer to peer 
at least I tried a DOD 988988 to 88 . Have no impact- receiver see 98890



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