Yealink SIP-T54S Administrator's Manual page 592

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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UPDATE, MESSAGE
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Procedure
Reserve # in User Name can be configured using the following methods.
Central Provisioning
(Configuration File)
Web User Interface
Details of the Configuration Parameter:
sip.use_23_as_pound
Description:
Enables or disables the IP phone to reserve the pound sign (#) in the user name.
0-Disabled (convert the pound sign into "%23")
1-Enabled
Web User Interface:
Features->General Information->Reserve # in User Name
Phone User Interface:
None
To configure reserve # in user name feature via web user interface:
Click on Features->General Information.
1.
566
300
<y0000000000xx>.cfg
Parameter
Configure reserve # in user name.
Parameter:
sip.use_23_as_pound
Configure reserve # in user name.
Navigate to:
http://<phoneIPAddress>/servlet?p
=features-general&q=load
Permitted Values
0 or 1
Default
1