User's Manual
Table Of Contents
    P a g e  | 53  
GXW42xx User Manual 
Version 1.0.5.43 
Check SIP User ID for 
Incoming INVITE 
Default is No. If set to Yes, SIP User ID will be checked in the Request 
URI of the incoming INVITE. If it doesn't match the phone's SIP User 
ID, the call will be rejected. Direct IP calling will also be disabled. 
Accept Incoming SIP from 
Proxy Only 
Default is No. If set to Yes, SIP User ID will be checked in the Request 
URI of the incoming INVITE. If it doesn't match the phone's SIP User 
ID, the call will be rejected. Direct IP calling will also be disabled. 
Authenticate Incoming INVITE 
Default  is  No.  If  set  to  Yes,  the  phone  will  challenge  the  incoming 
INVITE for authentication with SIP 401 Unauthorized response. 
Authenticate server certificate 
domain 
Default  is  No.  If  this  is  set  to  Yes,  device  will  check  the  server  TLS 
certificate to ensure that  the Common  Name matches  the configured 
SIP server 
Authenticate server certificate 
chain 
Default  is  No.  If  this  is  set  to  Yes,  device  will  check  the  server  TLS 
certificate to ensure that it is authorized by a known Certificate Authority 
Fax Settings 
Fax Mode 
T.38 (Auto Detect) FoIP by default, or Pass-Through (must use codec 
PCMU/PCMA) 
Fax Tone Detection Mode 
Default is Callee. This decides whether Caller or Callee sends out the 
re-INVITE for T.38 or Fax Pass Through. 
Send Re-INVITE After Fax 
Completion 
Default  is  No,  If  set  to  “Yes”,  device  will  send  an  INVITE  with  audio 
vocoders upon competition of Fax to continue session in audio only. 
Send Re-INVITE After Fax 
Tone 
If set to “Yes”, device will send a Re-INVITE after Fax tone is detected, 
disabling will only work under Broadsoft feature. 
Enable Silence Detection for 
Fax Disconnect 
For fax machines that do not send a Disconnect when fax is done. This 
option Enables/Disables the detection of silence in order to  know the 
fax has finished. The silence period is non-configurable and fixed to 7 
seconds. 
Audio Settings 
Preferred DTMF method (in 
listed order) 
The GXW42XX supports up to 3 different DTMF methods including in-
audio, via RTP (RFC2833)  and via  Sip Info.   The  user can configure 
DTMF method in a priority list. 










