Set "Mode" field, automatically when the request comes from Self-Service portal

Set "Mode" field, automatically when the request comes from Self-Service portal

Hi all.
I want to know if i can set the field "Mode" (Options: Mail, Phone, Self-Service Portal, etc.), automatically, if the request is coming from the portal. There is any marker who identifies the origin of the request?
It is possible to make a script, for this auto setting.

Thanks in advance.

Regards.
Facundo

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