5.8.3. Dialing Procedures 
The DH-Länder handles several dialing procedures. You control these
with COP and the DIALTYPE element in the AMO TACSU. To allow for different
procedures in incoming and outgoing seizures, use DIALTYPE = iii-ooo
(1st value for incoming, 2nd value for outgoing).
The usual dialing procedures are: MOSIG-DTMF, DTMF-DTMF, DIP-DIP,
MFC-MFC. The other procedures DIPA, MFP1, MFP2, MFRP, and MFRS are used
in the CIS countries.
MOSIG-DTMF: Main station interfaces (incoming call, outgoing loop,
and DTMF dialing).
DTMF-DTMF, DIP-DIP: double configured DID (direct inward dialing)
line with DTMF (dual tone multi-frequency signaling) or DIP (dial pulse
signaling) in both directions.
MFC-MFC: double configured DID line with MFC signaling.
If you use outgoing DTMF dialing, you also need the COP DTMF and DTM1
(or DTM2, etc.) to control the DTMF SIU (signaling unit). In the same
way, you need the COP BR64 and IDP1 (or IDP2, etc.) when you use DIP
dialing to control the pulse and the time between pulse series.