Verify the following settings in your OBi:
Service Providers -> ITSP Profile B -> General -> Name : Anveo
Service Providers -> ITSP Profile B -> SIP -> ProxyServer :
sip.anveo.comService Providers -> ITSP Profile B -> SIP -> ProxyServerPort : 5010
Voice Services -> SP2 Service -> X_ServProvProfile : B
Voice Services -> SP2 Service -> AuthUserName : (sip username)
Voice Services -> SP2 Service -> AuthPassword : (sip password)
Voice Services -> SP2 Service -> URI : (Default checked)
Voice Services -> SP2 Service -> CallerIDName : (callerid name)
If your router has a SIP ALG option, disable it.