Tried this "so you need to send forward the incoming calls of your DID straight to the SIP URI, without any authentication" from VOIPMS
and the log shows below:
DialPlan 20:25:20:887 sip1: call from sip:+1703637xxxx@74.125.240.68 to Lukex.
DialPlan 20:25:20:918 sip1: Commencing Dial with:
1110497xxxx@houston.voip.ms.
DialPlan 20:25:20:918 sip1: Attempting to locate a provider for call leg: sip:
1110497xxxx@houston.voip.ms.
DialPlan 20:25:20:918 sip1: ForkCall commencing call leg to sip:
1110497xxxx@houston.voip.ms.
DialPlan 20:25:20:918 sip1: Switching to sip:
1110497xxxx@houston.voip.ms:5060 via udp:69.59.142.213:5060.
DialPlan 20:25:20:918 sip1: SDP on UAC call had public IP not mangled, RTP socket 74.125.240.68:21146.
DialPlan 20:25:21:872 sip1: Response 407 Proxy Authentication Required for sip:
1110497xxxx@houston.voip.ms.
DialPlan 20:25:21:872 sip1: Forward leg failed, authentication was requested but no credentials were available.
DialPlan 20:25:21:872 sip1: UAS call failed with a response status of 480 and lukex Not available.
Also tried this in dial plan
sys.SetFromHeader("Myname","myusername","houston.voip.ms")
with SIP Binding registered and not registered and pass of CID to cell is still my VOIPMS #
I am waiting to hear back from VOIPMS about auth being required. (will update then)