level3

  1. johnpi

    CenturyLink / Level3 SIP trunk setup

    Steps I used to successfully setup a Level3 / CenturyLink sip trunk with 3CX PBX v15.5. Get things preped CL/L3 will send you some info on the SIP trunk including "SIP signaling IP", and "RTP IP". Setup your ACLs on your firewall to allow traffic from the IP and UDP port provided in the...
    • johnpi
    • Thread
    • centurylink level3 sip configuration education sip provider
    • Replies: 1
    • Forum: Phone System / PBX
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