10.55.4.5. Timer 
- The timers in the ECMA, DSS1 and CorNet circuits must be set to "0" (T302, T303, T304)
- If no "ANSWER" is transmitted, the audio path of the step by step dialing connection becomes active only after the timer has run out (DTIM2->TYPEDH=GEN-> CTDL). If the timer had not run out, the subscriber can dial further digits for step by step dialing. The audio path has already been connected but the speech path has not.