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Polycom VoIP phones can use standard .WAV files as ring tones. Choose your .WAV file of choice and make sure it's in the correct format:
Check if it's in the right format:
# file rington.wav ringtone.wav: RIFF (little-endian) data, WAVE audio, ITU G.711 mu-law, mono 8000 Hz
If not, you can convert it with sox:
# sox mywave.wav -r 8000 -U -c1 mywave.wav resample -ql
Place the .WAV file in the FTP folder your Polycom phones retrieve their SIP information from. If you edit sip.cfg you'll find a line as shown below. You can edit that line and put your own .WAV files in there.
... <sampled_audio saf.1="SoundPointIPWelcome.wav" saf.2="" saf.3="" saf.4="" saf.5="" saf.6="" saf.7="" saf.8="" saf.9="" saf.10="" saf.11="" saf.12="" saf.13="" saf.14="" saf.15="" saf.16="" saf.17="" saf.18="" saf.19="" saf.20="" saf.21="" saf.22="" saf.23="" saf.24=""/> ...
Now, on your Polycom phone (I'm using a IP 430 SIP, yours might differ a bit if you're using another model), navigate the menus like this:
[Menu] [3] (Settings) [1] (Basic) [3] (Ring Type)
Scroll to the bottom of the list to see your custom ring tones.