Of course, you could skip all of the drama and just install Chan-SCCP-B driver and SCCP Manager from GitHub and get a “Cisco style” management interface that works with the phones in Skinny mode. This also avoids the “SIP Crippling” features that Cisco adds to the SIP Software to make sure that your SIP experience sucks and you’ll come back to them with a new-found appreciation for their abuse.