Yealink T54S

Troubleshooting
553
Default
0
Parameter
sip.unreg_with_socket_close
<y0000000000xx>.cfg
Description
It enables or disables the IP phone to close the socket immediately when the user
deregisters the corresponding account(s).
Permitted
Values
0-Disabled
1-Enabled
Default
0
Parameter
account.X.check_cseq.enable
[1]
<MAC>.cfg
Description
It enables or disables the IP phone to check if the CSeq sequence number in the
request is lower than that in previous request on the same dialog.
Permitted
Values
0-Disabled
1-Enabled. If the CSeq sequence number in the request is lower than that in previous
request, the IP phone will reject the request.
Default
1
Parameter
account.X.check_to_tag.enable
[1]
<MAC>.cfg
Description
It enables or disables the IP phone to check if the To-tag is carried in the To header in
renewal request.
Permitted
Values
0-Disabled
1-Enabled. If the To-tag does not exist, the IP phone will reject the request.
Default
0
Parameter
features.call_invite_format
<y0000000000xx>.cfg
Description
It configures the format of callee field in the INVITE message.
Permitted
Values
0-sip:XXX
1-tel:Number, you need to set “account.X.outbound_proxy_enable" to 1.
Default
0
Parameter
sip.escape_characters.enable
<y0000000000xx>.cfg
Description
It enables or disables the IP phone to convert ASCII characters.
Permitted
Values
0-Disabled
1-Enabled
Default
0
Parameter
sip.tcp_port_random_mode
[1]
<y0000000000xx>.cfg
Description
It configures the listening port mode.