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Set Alert-Info on the INVITE message to tell the phone that the call originated from an internal extension.


FS Dialplan
This is how it looks like on the SIP INVITE message.


SIP Invite


FreeSWITCH adds Alert-Info header to the INVITE.

Polycom File

Set the Polycom phone to ring differently for internal calls.

In sip.cfg you need to change the following lines.


See also