This function is not supported on this platform. However, the UC5xx series is capable of doing this. The only modification you can do to the ringtone is change it for all calls. I know it seems like a few lines of code would solve the problem, but this platform does not do that. The reason for this is the phones do not know how to tell between internal or external calls. The phones use sip and in the invite it just has the invited extension with the from field in the same format, effectively all calls are internal calls because the SPA400/SPA9000 is actually making the call to the phone.
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This document is attempt to recreate content of original document created by famous @Patrick Born. Cisco has considered to destroy such valuable document for an unknown reason.Cisco SPA series phones and ATAs can use certificate-authenticated HTTPS (SSL) ...
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