Grandstream Networks HT502 User Manual page 52

Conference
Remove OBP from Default is No. When option YES is chosen, the Out Bound Proxy will be removed
Route Header from Route header.
Support SIP Instance Default is Yes. If set to Yes, the contact header in REGISTER request will
ID contain SIP
Instance ID as defined in IETF SIP Outbound draft.
Validate incoming Default is No. If set to yes all incoming SIP messages will be strictly validated
SIP message according to RFC rules. If message will not pass validation process, call will be
rejected.
Check SIP User ID Default is No. Check the incoming SIP User ID in Request URI. If they don't
for incoming INVITE match, the call will be rejected. If this option is enabled, the device will not be
able to make direct IP calls.
Authenticate Default is No. If set to Yes, device will challenge the incoming INVITE for the
incoming INVITE Authenticate ID and Password with 401 Unauthorized.
Authenticate Server Default is No. If set to Yes, device will check the server TLS certificate to ensure
Certificate Domain that the Common Name matches the configured SIP server
Authenticate Server Default is No. If set to Yes, device will check the server TLS certificate to ensure
Certificate Chain that it is authorized by a known Certificate Authority
Trusted CA Uses the certificate for Authentication if "Check Domain Certificates" is set to
Certificates "Yes"
Allow Incoming SIP Default is No. Check the incoming SIP messages. If they don't come from the
Messages from SIP SIP proxy, they will be rejected. If this option is enabled, the device will not be
able to make direct IP calls.
Proxy Only
Use Privacy Header If set to Default, it will only add Privacy or PPI header when special feature is
not Telkom SA or CBCOM.
Use P-Preferred- If set to Default, it will only add Privacy or PPI header when special feature is
HT502 User Manual
P a g e | 51