Yealink SIP-T3 Administrator's Manual page 600

1-Enabled. If the CSeq sequence number in the request is lower than that in the previous request, the
phone will reject the request.
Default 1
Parameter account.X.check_to_tag.enable
Description It enables or disables the phone to check if the To-tag is carried in the To header in renewal request.
0-Disabled
Permitted
Values
1-Enabled. If the To-tag does not exist, the phone will reject the request.
Default 0
Parameter features.call_invite_format
Description It configures the format of callee field in the INVITE message.
0-sip:XXX
Permitted
Values
1-tel:Number, you need to set "account.X.outbound_proxy_enable" to 1.
Default 0
Parameter sip.escape_characters.enable
Description It enables or disables the phone to convert ASCII code into corresponding symbol.
Permitted
0-Disabled
1-Enabled
Values
Default 1
Target characters: %5F (escape character % plus the ASCII characters 5F)
1. If you want to convert the ASCII code, set the following:
sip.escape_characters.enable = 1
sip.reserve_characters = %NULL%
Case Scen-
Result: The target characters %5F are converted to _.
ario
2. If you do not want to convert the ASCII code, set the following:
sip.escape_characters.enable = 0
sip.reserve_characters = %
Result: The target characters %5F remain the same.
Parameter sip.reserve_characters
It specifies the characters that the phone does not recognize as the escape one.
Description
Multiple characters are not separated.
Permitted
String
Values
Default Blank
Supported
All phones except T48G, T46G, T42G, T41P and T29G
Devices
Related
sip.escape_characters.enable
Parameters
Parameter sip.tcp_port_random_mode
[1]
Configuration Parameters
<MAC>.cfg
<y0000000000xx>.cfg
<y0000000000xx>.cfg
<y0000000000xx>.cfg
<y0000000000xx>.cfg
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