There is a note on the SipBroker website regarding Ixcall to "Wait for second tone"
The sequence you are dialling looks correct assuming you are waiting for the system prompts.
Failure to connect may be due to the end point not recognizing the dial tones correctly.
This may be a problem of the phone used. Wired high quality phones seem to yield better results as compared to cordless phones. Or it may be a problem of the phone connection going through a business PABX and/or through the PSTN network.
Slow deliberate dialing with a very defined gap between the numbers also helps sometimes.
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