We are currently using POTS lines going into the SL1100 and would like to switch to 10 SIP Trunks.

I am trying to determine what equipment and licensing would be needed. I believe we need a new card (VOIP Daughter Board??) but I'm unclear how many SIP Trunks this enables and how we get more (buy licensing, or additional cards). New to the PBX and to SIP Trunk so any help would be greatly appreciated.