I have IP Communicator 2 registered to CCM 6.0 with SCCP (DN 1007 on pcap) and 3rd party "P2000W" registered with SIP (DN 1009).
I'm able to place calls from the SIP to SCCP but when trying opposite IPCC gets a busy tone. Wireshark sees SIP msg 400, pcap attached.
CCM or codec problem, don't get it? CCM has very basic setup and auto registering. Any tips appreciated.