[SR-Users] I_SCSCF_select function dont return the next SCSCF in IMS network!!!

[Mojtaba]

Hello,
Today i have a strange problem in IMS network.
All nodes (pcscf,icscf,scscf and hss) are configured in independent server.
My domain is default(open-ims.test)

Now when i want to register bob at open-ims.test, I get this error from ICSCF:
500 Error in request.
When i saw the log files, i found the icscf could not found the next
node(scscf) in registration path. As i defined prefered scscf_uri in
configuration file, Why the icscf, could not found the scscf?
The dns server works correctly and i have ping of scscf.open-ims.test
from icscf node.
When i trace the diameter packets, the icscf connect to hss
successfully but dont send UAR to hss while registration proccess!!
It's strange.
Please let me know why i have this problem,
Thanks With Regards.
-- 
--Mojtaba Esfandiari.S