Problem with DTMF-tons from Lync-SIP-trunk to DISA substitution!

[pax]

ABC-F is more likely used for internal connections (like other ALU systems).
Did you try with ISDN-All-Countries ?

Grate!!! “ISDN-All-Countries” made the trick. Now the DTMF-tons work all the way to the end user. Thank you!