I found this thread when searching for my issue.  I was setting this up in a lab and had the same symptoms.  Found a fix so I thought I'd share in case it helps.  When enabling webbridge3 I had an error stating "FAILURE: Error loading the c2w trust b...

Hi Anisha,This is from the CME SRND, but has some good ECS/H450 info. http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/srnd/design/guide/intcmecm.html#wp1075557Good luck