An IVR (interactive voice response) system can be used to do any action, such as routing the person to the appropriate phone number.
Using the following voice_start configuration allows doing just that with the 46elks API.
{
"ivr": "http://www.46elks.com/download/DummySupportIVR.wav",
"1": {
"connect": "+461890510"
},
"2": {
"connect": "+461890511"
}
}