2N Omega series - VoIP manual v1.4 - Manual (Page 59)

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To delete a routing rule, use the symbol. Or, tick off the last table
column checkbox and click on Remove selected items .
There is an Add rule icon below the table. Click on it to display the rule
defining form.
The figure below shows the SIP proxy routing rule setting form. The form
fields correspond to the headers of the above-displayed table.
The form and the table contain the following fields:

If prefix – if the called subscriber's URI (Uniform Resource Identi-
fier) starts with this string, this rule is used for routing. In the SIP
environment, the URI is introduced with the „sip:‟ prefix, which has
to be included in the value in this field.

Remove
– the number of characters following the „sip:‟ prefix to
be removed from the URI before processing.

Add – the string to be inserted in the URI behind the „sip:‟ prefix.