Grandstream Networks DP720 Administration Manual page 38

Specifies which end will act as refresher for outgoing calls:
UAC Specify
Refresher
Default is Omit.
UAS Specify Specifies which end will act as refresher for incoming calls:
Refresher
Default is Omit.
Force INVITE Uses INVITE message to refresh the session timer. Default is No.
SIP Settings - Security Settings
Validate Incoming Defines whether incoming messages will be validated or not. Default is No.
Messages
Check SIP User ID for Checks SIP User ID in the Request URI of incoming INVITE; if it doesn't match the base SIP
Incoming INVITE User ID, the call will be rejected. Direct IP calling will also be disabled. Default is No.
Checks SIP address of the Request URI in the incoming SIP message; if it doesn't match
Accept Incoming SIP
from Proxy Only the SIP server address of the account, the call will be rejected. Default is No.
Authenticate Challenges the incoming INVITE for authentication with SIP 401 Unauthorized message.
Incoming INVITE Default is No.
Authenticate Server Checks server TLS certificate to ensure that common name matches the configured SIP
Certificate Domain server. Default is No.
Authenticate Server Checks server TLS certificate to ensure that it is authorized by a known certificate authority.
Certificate Chain Default is No.
Trusted CA Certificate Treats entered certificate as a valid CA for authenticating the server TLS certificate.
Default is No.
Audio Settings
Preferred DTMF Sorts DTMF methods (in-audio, via RTP (RFC2833) or via SIP INFO) by priority.
method (in order)
Disable DTMF Uses above DTMF order without negotiation. Default is No.
Negotiation
DTMF Payload Type Defines payload type for DTMF using RFC2833.
Preferred Vocoder Configures vocoders in a preference list (up to 8 preferred vocoders) that will be included

UAC: The base station acts as the refresher.

UAS: Callee or proxy server act as the refresher.

UAS: The base station acts as the refresher.

UAC: Callee or proxy server act as the refresher.
DP750/DP720 Administration Guide
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