Yealink SIP-T48G Administrator's Manual page 390

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Details of Configuration Parameters:
features.call_num_filter
Description:
Configures the characters the IP phone filters when dialing.
If the dialed number contains configured characters, the IP phone will automatically
filter these characters when dialing.
Example:
features.call_num_filter = ,-
If you dial 1010%, the IP phone will filter the character % and dial out 1010.
Note: If it is left blank, the IP phone will not automatically filter any characters when
dialing. If you want to filter just a space, you have to set the value to " ," (a space
first followed by a comma).
Web User Interface:
Features->General Information->Call Number Filter
Phone User Interface:
None
To configure the characters the IP phone will filter via web user interface:
1. Click on Feature->General Information.
2. Enter the desired characters in the Call Number Filter field.
3. Click Confirm to accept the change.
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Parameters Permitted Values
String within 99 characters
Default
,-