The commercially known Sip Trunking Service or Sip Trunk, is already included in box into the SipCel Standard account, and for FREE. It just need to be customize it on behalf of your business need. Just sign-up for an account, and get it activated. Then under the SIP/IAX tab, into the customer panel, you would find the Sip Trunk Details and how to configure your PBX system within.
** Kindly be aware, that the default Sip Trunk is monocannel, and to get additional channels, SipCel may provide you whatever channels you may need for FREE, just raise a ticket, or discuss this issue with your Key Account Manager to enable you more channels capacities.
We just do it Simply, and can’t be more simple then simple
<<Everything should be made as simple as possible, but not simpler>> Albert Einstein (1879–1955)
In SipCel simplicity is our Spirit, and Serving your Business is the Spirit of our Business!!