Ticket #520 (Open) reported by Leonardo - can't register phone

I’ve this problem with callweaver svn-1.2 SVN-7555 and a yealink t-20 phone with 9.50.0.50 firmware release. I can’t register the phone.

<—SIP read from 77.240.XXX.XXX:42766: REGISTER sip:77.239.XXX.XXX SIP/2.0 Via: SIP/2.0/UDP 192.168.1.204:5062;rport;branch=z9hG4bK994596227 From: “204” ;tag=32081892 To: “204” Call-ID: 209718645@192….