By default, the following numbers show up on the caller ID:
Leg 1 (Call to Business): 619-770-1993 (this is the Speak2Leads main office line)
Leg 2 (Call from Business to Lead): Phone number that Speak2Leads dialed on Leg 1 which pressed '2'.
Example: If S2L is dialing individual cell phone numbers, the cell phone of the agent who pressed '2' would show up on the lead's caller ID. If S2L is dialing a single hunt line, the hunt line would show up on the lead's caller ID.