Grandstream Networks HT881

and doubling of T1 continues until it reaches the T2 value. The default is 4 seconds.
SIP Timer D

Congures SIP Timer D dened in RFC3261. 0 – 64 seconds. Default is 0.
Do Not Escape '#' as %23 in SIP URI
Replaces # by %23 in some special situations.
Default is No.
Disable Multiple m line in SDP Sends only one m line in SDP, regardless of how many m elds are in the incoming SDP. Default is No.
Enable 100rel
Appends “100rel” attribute to the value of the required header of the initial signaling messages.
Default is No.
Add Auth Header On Initial
REGISTER
Adds “Authentication” header with blank “nonce” attribute in the initial SIP REGISTER request.
Default is No.
Conference URI Allows users to manually congure the conference URL. The default is null.
Allow SIP Factory Reset
Allows to reset the devices directly through SIP Notify. If “Allow SIP Factory Reset” is set to “YES” under FXO
PORT, then the ATA receives the NOTIFY from the SIP server with Event: reset, the HT should perform a factory
reset after the authentication.
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 device.
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.