Grandstream Networks HT881

The authentication in this case can be either with:
The admin password if no SIP account is congured on the HT.
With the credentials of the SIP account if congured on the ATA.
SIP User-Agent
This feature allows users to congure SIP User Agent. If not congured, device will use the default User Agent
header.
SIP User-Agent Postx Congures the SIP User-Agent Postx
Add MAC in User-Agent
This feature allows users to congure "User-Agent" in the SIP header eld, when this feature is set to“No”,
"User-Agent" does not carry a MAC, when this feature is set “Yes except REGISTER”, "User-Agent" in
REGISTERSIP header eld does not carry MAC but other SIP packet header elds carries MAC, when this
feature is set to “Yes to all SIP”, "User-Agent" in the SIP packet header eld will carries the MAC.
Use MAC Header
This feature allows users to congure MAC Header in the SIP packet header eld, when this feature is setto
“No” ,the MAC header eld is not carried in the SIP packet header eld, when this feature is set to“REGISTER
Only”, the register packet header eld carries the MAC header eld but the remaining SIPpackets do not carry
MAC header elds, when this feature is set to “Yes to all SIP”, the MAC header eld iscarried in the SIP data
packet header eld.
Session Timer
Enable Session Timer Disable the session timer when this option is set to “No”. By default, this option is enabled.
Session Expiration
Enables SIP sessions to be periodically “refreshed” via a SIP request (UPDATE, or re-INVITE). When the session
interval expires, if there is no refresh via an UPDATE or re-INVITE message, the session will be terminated.
Session Expiration is the time (in seconds) at which the session is considered timed out, if no successful
session refresh transaction occurs beforehand. Valid range is 90-64800 seconds. Default is 180 seconds.
Min-SE Denes Minimum session expiration (in seconds). Default is 90 seconds.
Caller Request Timer
Uses session timer when making outbound calls if remote party supports it. Valid range is 90-64800 seconds.
Default is No.
Callee Request Timer
Uses session timer when receiving inbound calls with session timer request.
Default isNo.
Force Timer
Uses session timer even if the remote party does not support this feature. Selecting “No” will enable session
timer only when the remote party supports it. To turn off Session Timer, select “No” for Caller and Callee
Request Timer, and Force Timer. Default is No
UAC Specify Refresher
Species which end will act as refresher for outgoing calls.
Default isOmit.
UAC: The device acts as the refresher.
UAS: Callee or proxy server act as the refresher.
UAS Specify Refresher
Species which end will act as refresher for incoming calls. Default isOmit.:
UAS: The device acts as the refresher.
UAC: Callee or proxy server act as the refresher.
Force INVITE Uses INVITE message to refresh the session timer. Default is No.
When To Restart Session After Re-
INVITE received
Allows users to delay posting Media Change Event, it can be set to “Immediately” or to “After replying 200OK”
The default value is “Immediately”.
Security Settings
Validate Incoming SIP Message Checks the authenticity and integrity of incoming SIP messages for enhanced security.