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


FreeSWITCH

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.

sip.cfg

See also