When rotary dialing a '5' or higher digit on a phone line which is connected to an FXO port, it appears that Asterisk receives a "Ring begin" event from DAHDI (DAHDI_EVENT_RINGBEGIN).
This effectively results in Asterisk thinking there is an incoming call on the phone line any time someone is making an outbound call on it (directly on the line, not through Asterisk). In this case, since we don't wait for Caller ID before starting simple switch, it also begins executing dialplan immediately.
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