This is my OBi110 setup:
Browse to Service Providers -> ITSP Profile B -> General and enable X_SymmetricRTPEnable.
Also, given that Anveo use DNS SRV, it's nonsensical to explicitly specify their proxy server
host and port. Under Service Providers -> ITSP Profile B -> SIP, just set ProxyServer to
<B>"anveo.com",</B> and check Default for everything from ProxyServerPort through OutboundProxyPort.
<B>Enable</B> "X_DnsSrvAutoPrefix", "X_ProxyServerRedundancy"
Moodifying Stewarts data a bit,
(in ITSP Profile B -> General)
(in ITSP Profile B -> SIP)
(in SP2 Service -> SIP Credentials)
AuthUserName: (10 digit Anveo account number)
AuthPassword: (SIP password from Anveo site, different from your login password for Anveo)
EDIT: ***Not sure what "X_UseRefer (checked)" in Stewarts setup does. I do not have that checked on my OBi110. Maybe he can explain further.